An efficient N-heterocyclic carbene (NHC)-catalyzed asymmetric [3 + 4] annulation reaction of N-Ts hydrazones with 2-bromoenals has been developed. A series of functionalized tetrahydro-1H-1,2-diazepines with two consecutive stereocenters was obtained using NHCs as the catalyst in good yields with excellent diastereo- and enantioselectivities.
已开发出一种有效的N杂环卡宾(NHC)催化的N -Ts azo与2-溴烯醛的不对称[3 + 4]环化反应。使用NHCs作为催化剂,可得到一系列具有两个连续立体中心的功能化四氢-1 H -1,2-二氮杂卓类化合物,并具有良好的非对映选择性和对映选择性。
First synthesis of a highly strained cyclodeca-1,5-diyne skeleton via intramolecular Sonogashira cross-coupling
作者:Wei-Min Dai、Anxin Wu
DOI:10.1016/s0040-4039(00)01890-6
日期:2001.1
Cyclization of alkenyl bromides 6 and 11 containing a terminal alkyne was achieved by using an intramolecular cross-coupling reaction catalyzed by Pd(0) and Cu(I). Under the optimal reaction conditions, cyclodeca-1,5-diyne derivatives 7 and 12 were obtained in 43 and 28% yields, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.