Enantioselective synthesis of 1-arylethanediols by rhodium-catalyzed transfer hydrogenation of α-tosyloxyarylketones
摘要:
Catalytic transfer hydrogenation of alpha-tosyloxyarylketones mediated by a chiral rhodium complex using an azeotropic mixture of formic acid/triethylamine afforded the corresponding 1-arylethanediol monotosylates in excellent yield with high enantioselectivity.
Convenient synthesis of optically active 1,2-diol monosulfonates and terminal epoxides via oxazaborolidine-catalyzed asymmetric borane reduction of α-sulfonyloxy ketones
作者:Byung Tae Cho、Weon Ki Yang、Ok Kyung Choi
DOI:10.1039/b010155i
日期:——
A very convenient asymmetric synthesis of 1,2-diol monosulfonates and terminal epoxides with high optical purity via oxazaborolidine-catalyzedasymmetricboranereduction of α-sulfonyloxy ketones using N-ethyl-N-isopropylaniline–borane complex as borane carrier has been developed.
Iodobenzene‐catalyzed synthesis of α‐azidoketones and α‐thiocyanatoketones fromarylketones with MCPBA as a cooxidant is described. The method is simple, rapid and practical, generating α‐azidoketones and α‐thiocyanatoketones from the arylketone without isolation of α‐tosyloxyketones in good to excellent yields.
A facile and regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles using click chemistry
作者:Dalip Kumar、V. Buchi Reddy、Rajender S. Varma
DOI:10.1016/j.tetlet.2009.02.107
日期:2009.5
The reaction of α-tosyloxy ketones, sodium azide, and terminal alkynes in presence of copper(I) in aqueous polyethylene glycol afforded regioselectively 1,4-disubstituted 1,2,3-triazoles in good yield at ambient temperature. The one-pot exclusive formation of 1,4-disubstituted 1,2,3-triazoles involves in situ formation of α-azido ketones, followed by cycloaddition reaction with terminal alkyne. The
Iodine-Mediated α-Sulfonyloxylation of Alkyl Aryl Ketones with Oxone® and Sulfonic Acids
作者:Hideo Togo、Hiroki Kikui、Katsuhiko Moriyama
DOI:10.1055/s-0032-1318199
日期:——
α-iodoketone and a subsequently formed α-iodosylketone. The latter reacts with the sulfonicacid to afford the α-sulfonyloxyketone product. Alkyl aryl ketones are converted into the corresponding α-sulfonyloxyketones, in moderate to excellent yields, via a novel procedure that utilizes Oxone®, p-toluenesulfonic acid or methanesulfonic acid and molecular iodine in a mixture of acetonitrile and 2,2,2-trifluoroethanol
Palladium-catalyzed oxidative annulation of <i>N</i>-(8-quinolinyl) aryl carboxamides with 1-aryl-2-tosyloxy ethanones
作者:Qinghuang Long、Keran Zou、Wanrong Dong、Dexun Xie、Delie An
DOI:10.1080/00397911.2021.1952433
日期:2021.9.17
Abstract A novel and facile palladium-catalyzedannulation reaction between N-(8-quinolinyl) aryl carboxamides and 1-aryl-2-tosyloxy ethanones was herein demonstrated. The practical transformation took place readily in the presence of Pd(OAc)2 without any ligands, offering the desired 3-aryl-2-(8-quinolinyl) isoquinolin-1(2H)-ones with good functional groups tolerance (29 examples) and high efficiencies