Manganese(III)-based intramolecular macrocyclization of 3,3-diphenyl-2-propenyloxyoligomethylene 3-oxobutanoates
作者:Shunsuke Jogo、Hiroshi Nishino、Mikio Yasutake、Teruo Shinmyozu
DOI:10.1016/s0040-4039(02)02282-7
日期:2002.12
The reaction of 3,3-diphenyl-2-propenyloxytetramethylene 3-oxobutanoate (14) with manganese(ill) acetate dihydrate in boiling acetic acid caused the oxidative intramolecular radical cyclization to produce 13-methyl-11,11-diphenyl-3,8,12-trioxabicyclo[8.3.0]tridec-13-en-2-one (2(4)) in 94% yield. A similar oxidation of the 3,3-diphenyl-2-propenyloxyoligomethylene 3-oxobutanoates (1(n): n = 2, 3, 6, 8) gave the corresponding macrolides 2(n) (n = 2, 3, 6, 8) in moderate to good yields. A 17-membered crown ether-type macrolide 2, was also obtained in 80% yield by the intramolacular radical cyclization of the oxaethylene-tethered 3-oxobutanoate (11). The structure of the macrolides 2,, (n = 2, 3, 4, 6, 11) has been corroborated by an X-ray crystal structure analysis. (C) 2002 Elsevier Science Ltd. All rights reserved.