Partially fluorinated heterocyclic compounds Part 28 [1]. The hydrolysis of 1,3,4,5,6,7,8-heptafluoro-2-naphthylidenerhodanine to form ring-fused thiophenes. A significant proportion of a linear naphtho[2, 3-b]thiophene derivative accompanying an angular naphtho[1, 2-b]thiophen derivative
作者:Gerald M. Brooke、Jeremy M. Meara
DOI:10.1016/s0022-1139(00)80498-4
日期:1990.11
of the linearly cyclised product accompanying the angularly cyclised product. Decarboxylation of the mixture of (11) and (12) gave 4,5,6,7,8,9-hexafluoronaphtho[2, 3-b]thiophene (13) and 4,5,6,7,8,9-hexafluoronaphtho[1, 2-b]thiophene (14) respectively, while treatment of the mixture of (11) and (12) with diazomethane gave an inseparable mixture of the methyl 2-carboxylates (15) and (16) respectively
1,3-,4,5,6,7,8-七氟萘-2-甲醛(7),通过格氏反应由2-溴-1,3,4,5,6,7,8-七氟萘(9)制备)与N-甲基甲酰苯胺,与若丹宁反应,得到1,3,4,5,6,7,8-七氟-2-2-萘并金丝氨酸(5)。用碱水解(5),得到4,5,6,7,8,9-六氟萘并[2,3-b]噻吩-2-羧酸(11)和4,5,6,7,8的混合物由中间体硫醇盐(6)分别以22:78的比例取代萘环中3和1位的氟而生成的1,9-六氟萘[1,2-b]噻吩-2-羧酸(12)伴随成角度环化产物的线性环化产物的比例很高。(11)和(12)的混合物脱羧得到4,5,6,7,8,9-六氟萘并[2,3-b]噻吩(13)和4,5,6,7,8,9-六氟萘[1,