作者:Ren� Kiesewetter、Paul Margaretha
DOI:10.1002/hlca.19890720111
日期:1989.2.1
Mechanistic evidence for the light-induced ring opening of thiophen-2(5H)-ones 1 in alcohols affording α, β-unsaturated mercapto esters 2 is presented. Regio-and stereochemical aspects of the ring closure of alkenylthio (type 3) radicals 15 and 17 to S-heterocycles 16 and 18, of 3-thiahex-5-enyl radicals 4 to (tetrahydrothien-3-yl)methyl radicals 6 and of (2,3-dihydrothien-3-yl)methyl radicals 30 (type
给出了在提供α,β-不饱和巯基酯2的醇中噻吩2(5H)-ones 1在光诱导下的开环的机械证据。链烯基硫基(类型3)基团15和17到S杂环16和18的闭环,3-硫杂六-5-烯基基团4到(四氢噻吩-3-基)甲基6和的闭环的区域和立体化学方面(2,3-二氢噻吩-3-基)甲基基团30(类型7,丁烯基3-基团)至环丙烷-甲基基团29讨论。在2,3-二甲基丁-2-烯存在下于环己烷中辐照1(λ350 nm),尽管产率很低,但仍提供[2 + 2]环加合物14。