Oxidation and halogenation of methyl 4,5,6,7-tetrafluoro-benzo[b]thiophen-2-carboxylate
作者:I.M. Shirley
DOI:10.1016/0022-1139(93)02900-y
日期:1994.1
procedure in two steps from pentafluorobenzaldehyde and rhodanine. Its methyl ester (IB) was synthesised via the acid chloride (IC) by reaction with methanol. Oxidation of IB with either CF3CO2H/H2O2 or meta-chloroperbenzoic acid gave methyl 2,3-dihydro-2,3-epoxy-4,5,6,7-tetrafluorobenzo[b]thiophen-1,1-dioxide-2-carboxylate (II). Methyl 2,3-dichloro- 2,3-dihydro-4,5,6,7-tetrafluorobenzo[b]thiophen-2-carboxylate
通过改进的文献方法,由五氟苯甲醛和若丹宁分两步制备了4,5,6,7-四氟苯并[ b ]噻吩-2-羧酸(IA)。它的甲酯(IB)是通过酰氯(IC)与甲醇反应合成的。用CF 3 CO 2 H / H 2 O 2或间-氯过苯甲酸氧化IB,得到甲基2,3-二氢-2,3-环氧-4,5,6,7-四氟苯并[ b ]噻吩-1, 1-二氧化物-2-羧酸盐(II)。甲基2,3-二氯-2,3-二氢-4,5,6,7-四氟苯并[ b通过IB与氯或与硫酰氯和偶氮二异丁腈反应,制得[噻吩-2-羧酸酯(IIIA)。