作者:Fumiaki Yokokawa、Toshinobu Asano、Takayuki Shioiri
DOI:10.1016/s0040-4020(01)00593-2
日期:2001.7
The antiviral marine natural product (-)-hennoxazole A was efficiently synthesized by a convergent approach. The stereoselective synthesis of the functionalized tetrahydropyran fragment was accomplished by the Mukaiyama aldol reaction, chelation-controlled 1,3-syn reduction, Wacker oxidation, and acid catalyzed intramolecular ketalization. The nonconjugated triene fragment was synthesized by S(N)2 displacement of an allylic bromide with vinyllithium and the CrCl2-mediated iodoolefination followed by palladium-catalyzed cross coupling with MeMgBr. The final steps include the fragment coupling using DEPC and oxazole synthesis via an oxidation/cyclodehydration process. (C) 2001 Elsevier Science Ltd. All rights reserved.