Synthesis of Benzofurans from Isovanillin via C-Propenylation-O-Vinylation and Ring-closing Metathesis
作者:Eng-Chi Wang、Tzu-Wei Tsai、Keng-Shiang Huang、Sie-Rong Li、You-Feng Wang、Yu-Li Lin、Yung-Hua Chen
DOI:10.3987/com-04-10074
日期:——
2-Allyl-3-alkoxy-4-methoxyphenol, prepared from isovanillin via the Claisen rearrangement, O-alkylation and Baeyer-Villiger oxidation, were chloroethylated by two-phase reaction to furnish 1-allyl-3-alkoxy-(2-chloroethoxy)-4-methoxy- benzenes. The given compounds were treated with potassium tert-butoxide to undergo the isomerization of O-allyl group and dehydrochlorination of 2-chloroethoxy group to efficiently
合成了衍生自异香草醛的取代苯并呋喃。2-Allyl-3-alkoxy-4-methoxyphenol 由异香草醛通过 Claisen 重排、O-烷基化和 Baeyer-Villiger 氧化制备,通过两相反应氯乙基化得到 1-allyl-3-alkoxy-(2-chloroethoxy) )-4-甲氧基苯。用叔丁醇钾处理给定的化合物,使 O-烯丙基异构化和 2-氯乙氧基脱氯化氢,从而有效地构建具有 C-丙烯基-O-乙烯基官能团的前体,用于闭环复分解 (RCM)一锅。然后,然后对前体进行 RCM,以分别以良好的总产率提供 4,5-O-双官能化苯并呋喃。