3989-14-8Relevant academic research and scientific papers
Alkynylborinates in organoborane conversions
Soderquist,Soderquist, John A.,Rane,Rane, Anil M.,Matos,Matos, Karl,Ramos,Ramos, Jorge
, p. 6847 - 6850 (1995)
10-Methoxy-9-oxa-10-bora[3.3.2]decane (1), easily prepared from the oxidation of B-MeO-9-BBN with trimethylamine N-oxide (TMANO), is readily converted to alkynylborinate complexes (2) with its reaction with representative lithium acetylides. These complexes serve as efficient alkynylating agents in the Suzuki-Miyaura coupling and their demethoxylation furnishes stable alkynylboranes (3) which also provide a convenient new entry to cis-vinylboranes (5).
29Si and 13C NMR Spectra of Alkenyl- and Alkynyl-trimethylsilanes
Al-Hassan, Mohammed I.,Al-Najjar, Ibrahim M.,Al-Oraify, Ibrahim M.
, p. 1112 - 1116 (1989)
29Si and 13C chemical shifts in substituted alkenyl-and alkynyl-trimethylsilanes have been recorded and assigned.The 13C NMR study of R-alkynyltrimethylsilanes gave new evidence for p?-d? bonding or an equivalent interaction between the bonded carbon and
Synthesis of diphenylacetylenes containing donor and acceptor substituents with 4′-formyl-4-methoxydiphenylacetylene as an example
Gonzalez-Rojas,Oprunenko,Morales
, p. 474 - 475 (2004)
A method for the synthesis of diphenylacetylenes containing donor and acceptor groups in aryl substituents was proposed. 4′-Formyl-4- methoxydiphenylacetylene was synthesized as an example.
Regulation of peptide-π-peptide nanostructure bundling: the impact of ‘cruciform’ π-electron segments
Kale, Tejaswini S.,Tovar, John D.
, p. 6084 - 6090 (2016)
The self-assembly and photophysical properties of peptide-π-peptide molecules with ‘cruciform’ presentation of the π-electron core were studied. Derivatives of 1,4-bis(phenylethynyl)benzene were incorporated into a peptide backbone via the alkynylation of
Remote substituent control of the regioselectivity of the aryl- and vinylpalladation of 7-oxabicyclo[2.2.1]heptenes
Montalbetti, Christian,Savignac, Monique,Genet, Jean-Pierre,Roulet, Jean-Michel,Vogel, Pierre
, p. 2225 - 2228 (1996)
Pd-catalyzed arylations of 2-exo-cyano-7-oxabicyclo[2.2.1]hept-5-en-2-endo-yl acetate and 7-oxabicyclo[2.2.1]hept-5-en-2-one are regio- and stereoselective giving products of H2 (HCOOH) and Me3SiC ≡ CH coupling in which the aryl grou
Inverting Conventional Chemoselectivity in the Sonogashira Coupling Reaction of Polyhalogenated Aryl Triflates with TMS-Arylalkynes
Wang, Miao,So, Chau Ming
supporting information, p. 681 - 685 (2022/01/20)
A newly developed phosphine ligand with a C2-cyclohexyl group on the indole ring was successfully applied in a chemoselective Sonogashira coupling reaction with excellent chemoselectivity, affording an inversion of the conventional chemoselectivity order of C–Br > C–Cl > C–OTf. This study also provided an efficient approach to the synthesis of polycyclic aromatic hydrocarbons (PAHs) and the natural product analogue trimethyl-selaginellin L by merging of chemoselective Sonogashira and Suzuki–Miyaura coupling reactions.
Ynonylation of Acyl Radicals by Electroinduced Homolysis of 4-Acyl-1,4-dihydropyridines
Luo, Xiaosheng,Wang, Ping
supporting information, p. 4960 - 4965 (2021/07/20)
Herein we report the conversion of 4-Acyl-1,4-dihydropyridines (DHPs) into ynones under electrochemical conditions. The reaction proceeds via the homolysis of acyl-DHP under electron activation. The resulting acyl radicals react with hypervalent iodine(III) reagents to form the target ynones or ynamides in acceptable yields. This mild reaction condition allows wider functionality tolerance that includes halides, carboxylates, or alkenes. The synthetic utility of this methodology is further demonstrated by the late-stage modification of complex molecules.
Au(I) Catalyzed Synthesis of Densely Substituted Pyrazolines and Dihydropyridines via Sequential Aza-Enyne Metathesis/6π-Electrocyclization
Sugimoto, Kenji,Kosuge, Shuto,Sugita, Takae,Miura, Yuka,Tsuge, Kiyoshi,Matsuya, Yuji
supporting information, p. 3981 - 3985 (2021/05/26)
A gold(I) autotandem catalysis protocol is reported for the de novo synthesis of densely substituted pyrazolines and dihydropyridines from the corresponding imine derivatives in a highly regioselective fashion via a one-pot aza-enyne metathesis/6π-electrocyclization sequence. The substituents on the nitrogen atom of the imine perfectly control the reaction pathways from the pivotal 1-azabutadiene intermediate; thus, carbazates were converted into pyrazolines via 6π-electrocyclization of α,β-unsaturated hydrazones, while aryl imines provided dihydropyridines via 6π-electrocyclization of 3-azahexatrienes.
Atom-Economical Thiocyanation-Amination of Alkynes with N-Thiocyanato-Dibenzenesulfonimide
Wu, Haopeng,Shao, Chukai,Wu, Di,Jiang, Liang,Yin, Hongquan,Chen, Fu-Xue
, p. 5327 - 5335 (2021/04/06)
A highly regioselective protocol for intermolecular thiocyanation-amination of alkynes by N-thiocyano-dibenzenesulfonimide (NTSI) as the SCN and nitrogen sources has been developed. A C-S bond and C-N bond are simultaneously constructed in only one step. The reaction under simple mild conditions features a broad substrate scope, atom economy, high yields (up to 94%), and excellent functional group tolerance.
Sulfated polyborate-H2O assisted tunable activation of N-iodosuccinimide for expeditious mono and diiodination of arenes
Misal, Balu,Palav, Amey,Ganwir, Prerna,Chaturbhuj, Ganesh
supporting information, (2021/05/26)
Owing to both Lewis and Bronsted acid active sites on sulfated polyborate under homogenous conditions, we were keen on developing iodination protocol of arenes that can meet the requirement of regioselectivity and higher yield. The sulfated polyborate activates N-iodosuccinimide for mono iodination of highly activated substrates viz. phenols, anilines under anhydrous condition. Water tunes sulfated polyborate to generate more Bronsted acid sites resulting in rapid activation of NIS for diiodination. The protocol was equally applicable to diiodination of 4-hydroxyphenylacetic acid to synthesize 4-hydroxy-3,5-diiodophenylacetic acid, an intermediate of tiratricol, a thyroid treatment drug. This protocol was further integrated via one-pot sequential iodination and Sonogashira coupling to synthesize aryl acetylenes, building blocks for the synthesis of a variety of specialty chemicals, API, and natural products.
