Studies Aimed at the Total Synthesis of the Antitumor Antibiotic Cochleamycin A. An Enantioselective Biosynthesis-Based Pathway to the AB Bicyclic Core
作者:Jiyoung Chang、Leo A. Paquette
DOI:10.1021/ol0102592
日期:2002.1.1
[reaction: see text] A convergent, highly enantioselective synthesis of the fully functionalized AB sector of cochleamycin A is described. A pair of building blocks, crafted from L-malic and L-ascorbic acids, are conjoined in a manner that gives rise to an (E,Z,E)-1,6,8-nonatriene. On heating, the latter undergoes stereocontrolled intramolecular Diels-Alder cyclization via an endo transition state
[反应:见正文]描述了完全功能化的球菌霉素A的AB区段的会聚,高对映选择性合成。一对由L-苹果酸和L-抗坏血酸制成的构件以产生(E,Z,E)-1,6,8-壬三烯的方式连接在一起。在加热时,后者通过内过渡态经历立体控制的分子内Diels-Alder环化。