提出了一种在温和条件下制备咪唑并[1,2- a ]吡啶环体系的新方法。在催化的Sc(OTf)3存在下,在高温(80–140°C)下,在乙腈中用甲苯磺酸二甲基缩酮酯处理2-氨基吡啶,可得到高产率的咪唑并[1,2- a ]吡啶产物。该成环方法广泛适用于电子贫乏的2-氨基吡啶,并通过溴代酮与富电子和中性底物的反应,与经典的咪唑并[1,2- a ]吡啶环体系制备显示出互补性。讨论了过程的范围和机械方面的考虑。
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.
Studies on the Chemistry and Reactivity of α-Substituted Ketones in Isonitrile-Based Multicomponent Reactions
作者:Lijun Fan、Ashley M. Adams、Jason G. Polisar、Bruce Ganem
DOI:10.1021/jo8019708
日期:2008.12.19
Using the Passerini and Ugi reactions as representative tests, the utility of several alpha-substituted ketones R-CO-CH(2)-X (X = sulfonyloxy, acyloxy, azido, halo, hydroxy, and sulfonyl) in isonitrile-based multicomponent reactions was explored. In a relative rate study (R = PhCH(2)CH(2)), each of the alpha-substituted ketones underwent Passerinicondensation more rapidly than the parent ketone. Short
Selective Synthesis of Isoquinolines by Rhodium(III)-Catalyzed C–H/N–H Functionalization with α-Substituted Ketones
作者:Jie Li、Zhao Zhang、Mengyao Tang、Xiaolei Zhang、Jian Jin
DOI:10.1021/acs.orglett.6b01916
日期:2016.8.5
A rhodium(III)-catalyzed C–H/N–H bond functionalization for the synthesis of 1-aminoisoquinolines from aryl amidines and α-MsO/TsO/Cl ketones was achieved under mild reaction conditions. Thus, this approach provides a practical method for the site-selective synthesis of various synthetically valuable isoquinolines with wide functional group tolerance.