作者:Amareshwar Chatterjee、Bhaskar Sen、Swapan K. Chatterjee
DOI:10.1039/p19810001707
日期:——
Transformations of some 1-benzothiepin derivatives (1) into a 1-benzothiophen derivative (2a) through ring contraction are reported. Similar ring contraction of trans-1,2-dibromo-1,2,3,4-tetrahydronaphtho[2,1-b]thiepin (8) affords the thiophen derivative (9a). Treatment of the bromo-compounds (2a) and (9a) with base in the presence of catalysts provides in excellent yields the dienes (2d) and (9b)
据报道通过环收缩将一些1-苯并噻吩衍生物(1)转变为1-苯并噻吩衍生物(2a)。反式-1,2-二溴-1,2,3,4-四氢萘并[ 2,1 - b ]噻吩(8)的类似环收缩得到噻吩衍生物(9a)。在催化剂存在下用碱处理溴化合物(2a)和(9a)分别提供了优异的产率二烯(2d)和(9b)。