- Sulfur-Directed Ligand-Free C-H Borylation by Iridium Catalysis
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An iridium-catalyzed ortho C-H borylation reaction directed by cyclic dithioacetal moiety is disclosed. A series of borylation products were obtained in moderate to good yields under mild conditions in exclusive mono- and ortho-regioselectivity. Thus, the 1,3-dithiane or 1,3-dithiolane group serves as a remarkable effective directing group for C-H borylation without any ligand assistance. The further transformations of the borylation products are also carried out to change boryl group to other functional groups.
- Liu, Li,Wang, Guanghui,Jiao, Jiao,Li, Pengfei
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supporting information
p. 6132 - 6135
(2017/11/24)
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- Efficient thioacetalisation of carbonyl compounds
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The thioacetalisation of a variety of heterocyclic, aromatic, and aliphatic carbonyl compounds (1 mmol) with ethane-1,2-dithiol (1 mmol) using silica sulphuric acid (SSA) is presented as an efficient heterogeneous catalyst under mild and solvent-free cond
- Habibi, Davood,Rahmani, Payam,Akbaripanah, Ziba
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p. 417 - 421
(2014/01/06)
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- Aluminum hydrogen sulfate [Al(HSO4)3] as an efficient catalyst for the preparation of thioacetals
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Aluminum hydrogen sulfate, as a heterogeneous solid acid catalyst, has been used for the mild conversion of carbonyl compounds to their thioacetals using 1,2- and 1,3-dithiol under ambient conditions with short reaction times in high to excellent yield in
- Ghashang, Majid
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p. 2837 - 2842
(2013/07/26)
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- Oxidative cross-esterification of dithiolanes with alcohols through a cross-dehydrogenative coupling (CDC)/deprotection sequence
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An unprecedented oxidative cross-esterification in an equimolar mixture of dithiolanes, alcohols and water through a CDC/deprotection sequence has been developed. The reaction itself features simple experimental procedures under very mild conditions and offers a new strategic protocol for the direct and efficient synthesis of structurally diverse esters.
- Fu, Liang,Yao, Chang-Jiang,Chang, Ning-Jie,Chen, Jia-Rong,Lu, Liang-Qiu,Xiao, Wen-Jing
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supporting information; scheme or table
p. 506 - 508
(2012/01/15)
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- Silica-supported phosphorus pentoxide: A reusable catalyst for S,S-acetalization of carbonyl groups under ambient conditions
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Phosphorus pentoxide supported on silica gel (P2O 5/SiO2) efficiently acts as a highly active and reusable catalyst for cyclic and non-cyclic S,S-acetalization of a variety of carbonyl compounds under mild, solvent-free an
- Shaterian, Hamid Reza,Azizi, Kobra,Fahimi, Nafiseh
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experimental part
p. 85 - 91
(2012/01/06)
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- An efficient method for chemoselective thioacetalization of aldehydes in the presence of a catalytic amount of acidic ionic liquid under solvent-free conditions
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A water-stable Br?nsted acidic ionic liquid with an alkane sulfonic acid group was synthesized. This ionic liquid catalyzed the thioacetalization reaction smoothly to afford 1,3-dithianes in excellent yield and less time. In this article we describe a mil
- Hajipour, Abdol Reza,Azizi, Ghobad,Ruoho, Arnold E.
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experimental part
p. 1974 - 1978
(2010/03/31)
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- A mild method for the protection of aldehydes as dithioacetals and dithiolanes catalyzed by I2 generated in situ using Fe(NO 3)3.9H2O/Nai under heterogeneous conditions
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Structurally diverse aromatic aldehydes were thioacetalated in a clean and efficient reaction with ethane-1,2-dithiol and thiophenol based on the use of I2 generated in situ from Fe(NO3)3.9H 2O/NaI. The reaction occurs in good to high yield in dichloromethane at room temperature and the use of toxic and corrosive molecular iodine is avoided.
- Rostami, Amin,Nik, Heidar Ali Alavi,Roosta, Zahra Toodeh,Khazaei, Ardeshir
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experimental part
p. 431 - 434
(2009/12/03)
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- An efficient, continuous flow technique for the chemoselective synthesis of thioacetals
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By optimizing a reagent's residence time within a packed-bed reactor, it is possible to overcome selectivity issues frequently encountered in stirred reaction vessels. This important feature is demonstrated for the chemoselective protection of 4-acetylben
- Wiles, Charlotte,Watts, Paul,Haswell, Stephen J.
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p. 7362 - 7365
(2008/03/13)
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- 2,4,6-Trichloro-1,3,5-triazine catalyzed chemoselective transthioacetalization of aldehyde acetals and oxathioacetals
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A mild and efficient transthioacetalization of aldehyde acetals and oxathioacetals was carried out using 2,4,6-trichloro-1,3,5-triazine as a mild and inexpensive catalyst. Chemoselective transacetalization is impressive as aldehyde O,O- and O,S-acetals ar
- Bandgar, Babasaheb P.,Joshi, Neeta S.,Bettigeri, Sampada V.
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- A mild and chemoselective dithioacetalization of aldehydes in the presence of anhydrous copper (II) sulfate
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Various aldehydes have been protected with different thiols as dithioacetals with excellent yields using anhydrous copper sulfate as a mild and chemoselective catalyst. The reaction is carried out in a solvent and/or under solvent-free conditions. The transthioacetalization of oxyacetals into dithioacetals was also achieved in an excellent yield. Copyright Taylor & Francis Group, LLC.
- Moghaddam, Firouz Matloubi,Bardajee, Ghasem Rezanejade,Oskui, Afsane Arefi
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p. 1445 - 1450
(2007/10/03)
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- Chemoselective and solvent-free thioacetalization of aldehydes by a catalytic amount of NBS
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A chemoselective, straightforward, and rapid method for thioacetalization of aldehydes by use of 1,2-ethandithiol and a catalytic amount of N-bromosuccinimide under solvent-free conditions is reported. The reaction takes place in excellent yields and shor
- Hajipour, Abdol Reza,Ali Pourmousavi, Seied,Ruoho, Arnold E.
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p. 2807 - 2811
(2007/10/03)
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- A mild and chemoselective catalyst for thioacetalization under solvent free conditions
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Protection of a variety of carbonyl compounds as dithioacetals using P 2O5/SiO2 (75%), as a mild and chemoselective catalyst, was achieved under solvent free conditions in very good yields. Copyright Taylor & Francis Group
- Hajipour, Abdol R.,Zarei, Amin,Khazdooz, Leila,Zahmatkesh, Saeed,Ruoho, Arnold E.
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p. 387 - 395
(2007/10/03)
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- Iron(III) fluoride: A highly efficient and versatile catalyst for the protection of carbonyl compounds under solvent-free conditions
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Carbonyl compounds are successfully converted into oxathioacetals and dithioacetals with 2-mercaptoethanol and ethane-1,2-dithiol using a catalytic amount of iron(m) fluoride under solvent-free conditions. The catalysts were recovered and reused in variou
- Bandgar, Babasaheb P.,Kamble, Vinod T.,Kulkarni, Ashwini
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p. 607 - 610
(2007/10/03)
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- Ruthenium(III) chloride-catalyzed thioacetalization of carbonyl compounds: Scope, selectivity, and limitations
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A variety of carbonyl compounds can be easily and rapidly converted to the corresponding cyclic and acylic dithioacetals in the presence of a catalytic amount of ruthenium chloride in acetonitrile at room temperature. Some of the major advantages of this
- De, Surya Kanta
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p. 673 - 676
(2007/10/03)
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- Silica gel-supported polyphosphoric acid (PPA/SiO2) as an efficient and reusable catalyst for conversion of carbonyl compounds into oxathioacetals and dithioacetals
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A simple and efficient method for the conversion of carbonyl compounds to oxathioacetals and dithioacetals by using polyphosphoric acid supported on silica gel (PPA/SiO2) as an acid catalyst have been developed. PPA/SiO2 is easily re
- Aoyama, Tadashi,Takido, Toshio,Kodomari, Mitsuo
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p. 2307 - 2310
(2007/10/03)
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- Lutetium triflate as an efficient and recyclable catalyst for chemoselective thioacetalization of aldehydes
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Lutetium Inflate has been found to be an efficient and recyclable catalyst for chemoselective thioacetalization of aldehydes.
- De, Surya Kanta
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p. 4401 - 4408
(2007/10/03)
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- Scandium Chloride-Catalyzed Chemoselective Thioacetalization of Aldehydes
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A wide variety of acyclic and cyclic dithioacetals can be prepared chemoselectively from the corresponding aldehydes by employing a catalytic amount of scandium chloride in acetonitrile at room temperature.
- De, Surya Kanta
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p. 828 - 830
(2007/10/03)
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- Pr(OTf)3 as an efficient and recyclable catalyst for chemoselective thioacetalization of aldehydes
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Praseodymium triflate has been found to be an efficient and recyclable catalyst for chemoselective protection of aldehydes.
- De, Surya Kanta
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p. 2837 - 2840
(2007/10/03)
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- Yttrium triflate as an efficient and useful catalyst for chemoselective protection of carbonyl compounds
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Carbonyl compounds have been successfully converted into their corresponding oxathiolane, dithiolane, and dithiane derivatives with 2-mercaptoethanol, 1,2-ethanedithiol, and 1,3-propanedithiol using catalytic amount of yttrium triflate. In addition, by us
- De, Surya Kanta
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p. 2339 - 2341
(2007/10/03)
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- Cobalt(II)chloride catalyzed chemoselective thioacetalization of aldehydes
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A mild and chemoselective dithioacetalization procedure for the protection of various aldehydes in the presence of catalytic amount of cobalt(II)chloride is described.
- De, Surya Kanta
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p. 1035 - 1036
(2007/10/03)
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- Neodymium triflate as a recyclable catalyst for chemoselective thioacetalisation
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Neodymium triflate has been found to be an efficient and recyclable catalyst for the chemoselective protection of aldehydes.
- De, Surya Kanta
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p. 230 - 231
(2007/10/03)
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- New applications of solid silica chloride (SiO2-Cl) in organic synthesis. Efficient preparation of diacetals of 2,2-bis(hydroxymethyl)-1,3-propanediol from different substrates and their transthioacetalization reactions. Efficient regeneration of carbonyl compounds from acetals and acylals
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A new application of solid silica chloride, an easily available and efficient catalyst for the preparation of diacetal of 2,2-bis-(hydroxymethyl)-1,3-propanediol from aldehydes, acetals, acylals, and oximes, is described. Transthioacetalization of diacetals of 2,2-bis-(hydroxymethyl)-1,3-propanediol into their corresponding 1,3-dithianes and 1,3-dithiolanes in the presence of silica chloride is presented. Efficient regeneration of carbonyl compounds from their corresponding acetals, ketals, diacetals, and acylals in the presence of this catalyst also is described.
- Firouzabadi, Habib,Iranpoor, Nasser,Hazarkhani, Hassan
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p. 2847 - 2858
(2007/10/03)
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- Trichloroisocyanuric acid, as an industrial chemical, promotes transthioacetalization of diacetals of 2,2-bis (hydroxymethyl)-1,3-propanediol and cleavage of thioacetals
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Trichloroisocyanuric acid has been used as a mild, efficient, and new catalyst for transthioacetalization of diacetals of 2,2-bis (hydroxymethyl)-1,3-propanediol in CH2Cl2 at room temperature. A clean, easy, and general method for efficient deprotection of thioacetals to their corresponding carbonyl compounds using trichloroisocyanuric acid/silica gel and water system also is described.
- Firouzabadi, Habib,Iranpoor, Nasser,Hazarkhani, Hassan
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p. 2571 - 2577
(2007/10/03)
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- Comparative radioprotective activity of various pentagonal compounds with two heteroatomes
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Various heterocyclic compounds with two heteroatomes were synthesized and their potential radioprotective activity was tested. This study shows the interest of phenylthiazolidines derivatives in chemical radioprotection.
- Robbe,Fernandez,Dubief,et al.
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p. 235 - 243
(2007/10/02)
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