Asymmetric Synthesis of 1,2-Dioxolane-3-acetic Acids: Synthesis and Configurational Assignment of Plakinic Acid A
作者:Peng Dai、Tony K. Trullinger、Xuejun Liu、Patrick H. Dussault
DOI:10.1021/jo0522254
日期:2006.3.1
The first asymmetric synthesis of 1,2-dioxolane-3-acetic acids is reported. Key features include the stereoselective opening of enantiomerically enriched oxetanes by hydrogen peroxide, conversion of the resulting 4-hydroperoxy-2-alkanols to 3-alkoxy-1,2-dioxolanes, and Lewis acid mediated homologation of the latter with a thioester silyl ketene acetal. The approach is modeled on 3,5-dimethyl-5-hexadecyl-1
据报道,首次不对称合成1,2-二氧戊环-3-乙酸。主要特征包括通过过氧化氢对映体富集的氧杂环丁烷的立体选择性开放,将所得的4-氢过氧-2-链烷醇转化为3-烷氧基-1,2-二氧戊环以及路易斯酸介导的后者与硫酯硅烷基乙烯酮缩醛的同源性。该方法以未命名的天然产物3,5-二甲基-5-十六烷基-1,2-二氧戊环-3-乙酸(1a)为模型,并且优化的策略被应用于合成酚酸A的四种立体异构体(2),允许对该不完全表征的天然产物进行构型分配。