13414-95-4Relevant articles and documents
Ring construction of several heterocycles with phosphorus pentoxide-methanesulfonic acid (PPMA)
Cho, Hidetsura,Matsuki, Shinsuke
, p. 127 - 131 (1996)
The cyclization reactions with CH3SO3H/P2O5 (PPMA) or CF3SO3H/P2O5 (PPTMA) at 80-100°C for 3-10 min afforded several heterocycles (6, 7-dihydropyrrolo[2, 3-c]azepin-4,8(1H, 5H)-dione, 4-oxo-4,5,6,7-tetrahydrothianaphthene, carbostyril derivatives).
Efficient synthesis of 1-tetralones from 4-arylbutyric acids by combined use of solid acid catalysts and microwave irradiation
Hiroki, Kazuaki,Hatori, Makiko,Yamashita, Hiroshi,Sugiyama, Jun-Ichi
, p. 320 - 321 (2008)
Solid acid catalysts such as H-Beta zeolites effectively promote dehydrative intramolecular cyclization of 4-arylbutyric acids under microwave irradiation to give 1-tetralone derivatives in high yields. Copyright
Sustainable flow oppenauer oxidation of secondary benzylic alcohols with a heterogeneous zirconia catalyst
Chorghade, Rajeev,Battilocchio, Claudio,Hawkins, Joel M.,Ley, Steven V.
, p. 5698 - 5701 (2013)
A flow chemistry process for the Oppenauer oxidation of benzylic secondary alcohols using partially hydrated zirconium oxide and a simple carbonyl containing oxidant such as acetone, cyclohexanone, and neopentanal is reported. The heterogeneous oxidative system could be applied to a wide range of functionalized alcohol substrates, allowing clean and fast delivery of ketone products within a few minutes between 40 and 100 C.
Chemoselective Oxidation of Equatorial Alcohols with N-Ligated λ3-Iodanes
Mikhael, Myriam,Adler, Sophia A.,Wengryniuk, Sarah E.
supporting information, p. 5889 - 5893 (2019/08/26)
The site-selective and chemoselective functionalization of alcohols in complex polyols remains a formidable synthetic challenge. Whereas significant advancements have been made in selective derivatization at the oxygen center, chemoselective oxidation to the corresponding carbonyls is less developed. In cyclic systems, whereas the selective oxidation of axial alcohols is well known, a complementary equatorial selective process has not yet been reported. Herein we report the utility of nitrogen-ligated (bis)cationic λ3-iodanes (N-HVIs) for alcohol oxidation and their unprecedented levels of selectivity for the oxidation of equatorial over axial alcohols. The conditions are mild, and the simple pyridine-ligated reagent (Py-HVI) is readily synthesized from commercial PhI(OAc)2 and can be either isolated or generated in situ. Conformational selectivity is demonstrated in both flexible 1,2-substituted cyclohexanols and rigid polyol scaffolds, providing chemists with a novel tool for chemoselective oxidation.
Hydrogen bond donor solvents enabled metal and halogen-free Friedel–Crafts acylations with virtually no waste stream
Liu, Guangchang,Xu, Bo
supporting information, p. 869 - 872 (2018/02/09)
We have developed a metal and halogen-free Friedel–Crafts acylation protocol with virtually no waste stream generation. We propose a hydrogen bonding donor solvent will form a hydrogen bonding network and may provide significant rate enhancement for Friedel–Crafts reactions. Trifluoroacetic acid is one of the strongest H-bond donor solvents, which is also volatile and can be easily recovered by distillation without need for reaction workup. Our protocol is a ‘green’ Friedel–Crafts acylation process: 1) the catalyst can be recovered and reused; 2) using halogen free starting material (carboxylic acids anhydride or carboxylic acids); 3) no need for aqueous reaction work-up; 4) minimum or no waste steam generation.
NOVEL TRICYCLIC CALCIUM SENSING RECEPTOR ANTAGONISTS
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, (2015/07/07)
Novel tricyclic compounds of Formula (I) and pharmaceutically acceptable salts thereof are disclosed as useful for treating or preventing osteoporosis and similar conditions. The compounds are effective as calcium sensing receptor antagonists. Pharmaceutical compositions and methods of treatment are also included.
NOVEL TRICYCLIC CALCIUM SENSING RECEPTOR ANTAGONISTS FOR THE TREATMENT OF OSTEOPOROSIS
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, (2015/07/07)
Novel tricyclic compounds of the formula (I): and pharmaceutically acceptable salts thereof are disclosed as useful for treating or preventing osteoporosis and similar conditions. The compounds are effective as calcium sensing receptor antagonists. Pharmaceutical compositions and methods of treatment are also included.
Intramolecular Friedel-Crafts Acylation Reaction Promoted by 1,1,1,3,3,3-Hexafluoro-2-propanol
Motiwala, Hashim F.,Vekariya, Rakesh H.,Aubé, Jeffrey
, p. 5484 - 5487 (2015/11/18)
Simple dissolution of an arylalkyl acid chloride in 1,1,1,3,3,3-hexafluoro-2-propanol promotes an intramolecular Friedel-Crafts acylation without additional catalysts or reagents. This reaction is operationally trivial in both execution and product isolation (only requiring concentration followed by purification) and accommodates a broad range of substrates. Preliminary studies that bear upon potential reaction mechanisms are reported.
New combination of pharmacophoric elements of potent σ1 ligands: Design, synthesis and σ receptor affinity of aminoethyl substituted tetrahydrobenzothiophenes
Harel, Dipak,Schepmann, Dirk,Wünsch, Bernhard
, p. 490 - 497 (2013/10/22)
The aminoethyl substituted tetrahydrobenzothiophenes 4 resulted from combination of the pharmacophoric elements of the potent σ1 ligands 2 and 3. The aminoethyl substituted tetrahydrobenzothiophenes 4 were prepared in an 8-step synthesis starting with thiophene. Whereas the σ1 affinity of the N-benzyl derivative 4a is in the medium nanomolar range (Ki = 49 nM), the analogous N-cyclohexylmethyl derivative 4d exhibits low nanomolar affinity (Ki = 5.0 nM). The reduced σ1 affinity and σ2/σ1 selectivity of tetrahydrobenzothiophenes 4 compared to analogous spirocyclic piperidines 3 is attributed to the increased conformational flexibility of the aminoethyl side chain.
MULTICYCLIC COMPOUNDS AND METHODS OF USE THEREOF
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Page/Page column 110, (2011/06/25)
Provided herein are multicyclic compounds, methods of their synthesis, pharmaceutical compositions comprising the compounds, and methods of their use. The compounds provided herein are useful for the treatment, prevention, and/or management of various neurological disorders, including but not limited to, psychosis and schizophrenia.