作者:Willem F.J. Karstens、Marianne Stol、Floris P.J.T. Rutjes、Huub Kooijman、Anthony L. Spek、Henk Hiemstra
DOI:10.1016/s0022-328x(00)00935-9
日期:2001.4
Lactams and oxazolidinones containing a 3-butynyl side chain at the four- and the three-position, respectively, have been prepared by reductive alkylation of cyclic imides or by SN2′-substitution of bromopropadiene with highly functionalized enantiopure organozinc reagents. Treatment of these compounds with aryl halides and one vinyl bromide using Pd(PPh3)4 as a catalyst gives rise to a coupling-cyclization
内酰胺和恶唑烷酮分别在四个和三个位置上含有一个3-丁炔基侧链,是通过环酰亚胺的还原烷基化或用高度官能化的对映纯有机锌试剂对溴丙二烯进行S N 2'取代制得的。使用Pd(PPh 3)4作为催化剂,用芳基卤化物和一种乙烯基溴处理这些化合物会引起偶联环化反应,从而生成其中掺入了芳基或乙烯基部分的双环酰胺。值得注意的是,这些基团是立体选择性地顺式转移的关于氮亲核试剂到三键上。通过环化产物的晶体结构分析和NOE差光谱法已经获得了这种异常立体化学结果的结构证明。