a novel antimitotic agent, was synthesized in a highly stereo-controlled manner. The key steps were (1) an asymmetric allylation using a chiral allyltitanium reagent and a double-asymmetric Simmons-Smith cyclopropanation to introduce three chiral centers, (2) Wittig and Wittig-Horner reactions to construct the C(3–4) and C(7–10) alkenes, and (3) a direct conversion of the thiazolidine to the thiazoline
Curacin A(1),一种新型的抗有丝分裂剂,以高度立体控制的方式合成。关键步骤是(1)使用手性烯丙基
钛试剂和双不对称Simmons-Smith
环丙烷化的不对称烯丙基化反应引入三个手性中心,(2)Wittig和Wittig-Horner反应构建C(3-4)和C (7-10)烯烃,和(3)
噻唑烷直接转化为
噻唑啉。