作者:Munetaka Tokumasu、Hiroshi Ando、Yoshikazu Hiraga、Satoshi Kojima、Katsuo Ohkata
DOI:10.1039/a808526i
日期:——
rac-Hippospongic acid A of the reported structure 1 and the revised structure 2 were synthesized. The synthetic strategy of these compounds consists of homologation of (2E,6E,10E)-geranylgeraniol and (2E,6E)-farnesol, respectively, Wadsworth–Emmons reaction, and cyclization to form the tetrahydropyran ring bearing an α-methylene group on the carboxylic moiety. Spectral comparisons of the synthetic compounds 1, 2 and the natural product suggested that hippospongic acid A bears the structure of 2.
所报道的化合物1和修订结构2的rac-Hippospongic酸A已被合成。这些化合物的合成策略包括分别对(2E,6E,10E)-香叶香叶醇和(2E,6E)-金合欢醇进行同系化反应,Wadsworth-Emmons反应,以及形成在羧基部分带有α-甲基的二氢吡喃环的环合反应。通过对比合成化合物1、2与天然产物的光谱数据,表明Hippospongic酸A具有结构2。