2-Aza 1,3-dienes: a new and simple method for the synthesis of functionalized pyridine derivatives
摘要:
The synthesis of 4(1H)-pyridones and 4-chloropyridines from 2-aza 1,3-dienes is described, using carbonic acid derivatives. The process involves a [5 + 1] heterocyclization reaction, with formation of two new carbon-carbon bonds.
Catalytic diastereo- and enantioselective additions of versatile allyl groups to N–H ketimines
作者:Hwanjong Jang、Filippo Romiti、Sebastian Torker、Amir H. Hoveyda
DOI:10.1038/nchem.2816
日期:2017.12
and/or enantioselectively are much sought after. Various methods for enantioselective synthesis of α-secondary amines are available (for example, from additions to protected/activated aldimines), but those involving ketimines are much less common. There are no reported additions of carbon-based nucleophiles to unprotected/unactivated (or N–H) ketimines. Here, we report a catalytic, diastereo- and enantioselective
Rhodium-Catalyzed Asymmetric Hydrogenation of Unprotected NH Imines Assisted by a Thiourea
作者:Qingyang Zhao、Jialin Wen、Renchang Tan、Kexuan Huang、Pedro Metola、Rui Wang、Eric V. Anslyn、Xumu Zhang
DOI:10.1002/anie.201404570
日期:2014.8.4
Asymmetrichydrogenation of unprotected NH imines catalyzed by rhodium/bis(phosphine)‐thiourea provided chiral amines with up to 97 % yield and 95 % ee. 1H NMR studies, coupled with control experiments, implied that catalytic chloride‐bound intermediates were involved in the mechanism through a dual hydrogen‐bonding interaction. Deuteration experiments proved that the hydrogenation proceeded through
由铑/双(膦)-硫脲催化的未保护的NH亚胺的不对称氢化提供了手性胺,产率高达97%,ee值高达95% 。1 H NMR 研究与对照实验相结合,表明催化氯化物结合中间体通过双氢键相互作用参与了该机制。氘化实验证明氢化反应是通过与亚胺一致的途径进行的。
Enantioselective Hydrogenation of N−H Imines
作者:Guohua Hou、Francis Gosselin、Wei Li、J. Christopher McWilliams、Yongkui Sun、Mark Weisel、Paul D. O’Shea、Cheng-yi Chen、Ian W. Davies、Xumu Zhang
DOI:10.1021/ja903319r
日期:2009.7.29
N-H ketoimines 3a-3v are readily prepared in high yield via organometallic addition to nitrites and isolated as corresponding bench-stable hydrochloride salts. Homogeneous asymmetric hydrogenation of unprotected N-H ketoimines 3a-3v using Ir-(S,S)-f binaphane as catalyst provides chiral amines 4a-4v in 90-95% yield with enantioselectivities up to 95% ee.
Boroorganic compounds
作者:B. M. Mikhailov、G. S. Ter-Sarkisyan、N. N. Govorov
DOI:10.1007/bf00921722
日期:1976.9
2-Aza 1,3-dienes: a new and simple method for the synthesis of functionalized pyridine derivatives
作者:Jose Barluenga、Francisco Javier Gonzalez、Raquel Perez Carlon、Santos Fustero
DOI:10.1021/jo00024a011
日期:1991.11
The synthesis of 4(1H)-pyridones and 4-chloropyridines from 2-aza 1,3-dienes is described, using carbonic acid derivatives. The process involves a [5 + 1] heterocyclization reaction, with formation of two new carbon-carbon bonds.