Stereoselective approach to potential scaffold of A-nor B-aromatic OSW-1 analogues via [4+2] cycloaddition of o-quinodimethane
作者:Bozhi Li、Seiji Masuda、Daishiro Minato、Dejun Zhou、Kenji Sugimoto、Hideo Nemoto、Yuji Matsuya
DOI:10.1016/j.tet.2014.04.079
日期:2014.7
A-nor B-aromatic steroidal skeleton was efficiently constructed by means of o-quinodimethane chemistry with exclusive stereoselectivity. The benzocyclobutene substrate for generation of the o-quinodimethane intermediate and subsequent [4+2] cycloaddition could be synthesized via (E)-selective Julia–Kocienski olefination and diastereoselective Grignard addition reactions. The synthesized tricyclic steroid-like
A-nor B-芳香族甾体骨架是通过邻喹二甲烷化学方法以独特的立体选择性有效构建的。可以通过(E)选择性Julia-Kocienski烯化和非对映选择性Grignard加成反应合成用于生成邻喹啉甲烷中间体和随后的[4 + 2]环加成反应的苯并环丁烯底物。具有反式-二醇亚结构的合成的三环类固醇样化合物将用于可能的抗肿瘤OSW-1类似物与截短的类固醇糖苷配基的发散合成。