Generation and cyclization of nitrilium ions from amides. Asymmetric synthesis of fused azabicyclics
作者:Robert E. Gawley、Sanjay Chemburkar
DOI:10.1016/s0040-4039(00)84451-2
日期:1986.1
Treatment of 2° amides with PPSE affords nitrilium ions which may be cyclized onto appropriate terminators. The conditions are compatible with esters in the molecule, and further elaboration to pyrrolizidine and indolizidine rings is possible via asymmetric reduction.
Carbonylative C–C Bond Activation of Aminocyclopropanes Using a Temporary Directing Group Strategy
作者:Gang-Wei Wang、Olga O. Sokolova、Tom. A. Young、Ektor M. S. Christodoulou、Craig P. Butts、John F. Bower
DOI:10.1021/jacs.0c08973
日期:2020.11.11
Temporary directinggroups (TDGs) underpin a range of C-C bond activation methodologies; however, the use of TDGs for the regiocontrolled activation of cyclopropane C-C bonds is underdeveloped. In this report, we show how an unusualring contraction process can be harnessed for TDG-based carbonylative C-C bond activations of cyclopropanes. The method involves the transient installation of an isocyanate-derived
临时导向基团 (TDG) 是一系列 CC 键活化方法的基础;然而,TDGs 用于环丙烷 CC 键的区域控制活化的使用尚不完善。在本报告中,我们展示了如何利用不寻常的环收缩过程来激活环丙烷的基于 TDG 的羰基化 CC 键。该方法涉及异氰酸酯衍生的 TDG 的瞬态安装,而不是依赖于先前启用 TDG 的 CC 键活化中使用的羰基缩合事件。
Regioselective addition reactions of organometallic reagents with 3-benzylidene heterocyclic imines leading to the synthesis of pyrrolizidines
作者:Duy H. Hua、Didier Bensoussan、Ana A. Bravo
DOI:10.1021/jo00283a046
日期:1989.10
GAWLEY R. E.; CHEMBURKAR SANJAY, TETRAHEDRON LETT., 27,(1986) N 19, 2071-2074