Further Studies of Intramolecular Michael Reactions of Nitrosoalkenes for Construction of Functionalized Bridged Ring Systems
作者:Praveen Kumar、Puhui Li、Ilia Korboukh、Tony L. Wang、Hemant Yennawar、Steven M. Weinreb
DOI:10.1021/jo1024392
日期:2011.4.1
A wide variety of stabilized carbanions have been found to participate as nucleophiles in intramolecular Michael-type conjugate additions to in situ generated nitrosoalkenes to form bridged carbocyclic systems. The vinylnitroso platforms for these cyclizations have been prepared via two key steps involving ring-closing metathesis of vinyl chlorides and regioselective conversion of vinyl chlorides to
已发现多种稳定的碳负离子作为亲核试剂参与分子内迈克尔型共轭加成到原位生成的亚硝基烯烃以形成桥接碳环系统。用于这些环化的乙烯基亚硝基平台是通过两个关键步骤制备的,包括氯乙烯的闭环复分解和氯乙烯与次氯酸钠在冰醋酸/丙酮中的区域选择性转化为 α-氯酮。制备某些环化底物的另一种方法涉及使用更具反应性的烯醇醚作为必需的 α-氯酮的前体。还发现磺酰胺阴离子在此类反应中是有效的亲核试剂,导致形成 6-氮杂双环 [3.2.1] 辛烷。