Chemical Transformation from Dihydroisocoumarin into Benzylidenephthalide by Use of Regiospecific Oxidative Lactonization Mediated by Copper Chloride(II). Syntheses of Thunberginol F and Hydramacrophyllol A and B.
作者:Masayuki YOSHIKAWA、Emiko HARADA、Nobuhiro YAGI、Yasuhiro OKUNO、Osamu MURAOKA、Hiroshi AOYAMA、Nobutoshi MURAKAMI
DOI:10.1248/cpb.42.721
日期:——
Oxidative lactonization of 2-carboxystilbene mediated by CuCl2 proceeded regiospecifically to give the five-membered lactone. By utilizing this lactonization as a key reaction, chemical transformation from dihydroisocoumarine into benzylidenephthalide was accomplished, and it was applied to structural elucidation of two new phthalide, hydramacrophyllols A and B.
CuCl2 介导的 2-羧基二苯乙烯的氧化内酯化反应进行区域特异性,得到五元内酯。利用该内酯化反应作为关键反应,完成了从二氢异香豆素到亚苄基苯酞的化学转化,并将其应用于两种新的苯酞——Hydrmacrophyllols A和B的结构解析。