Generation of 2-lithio-2-(methylthio)-1,3-benzodithioles, new carboxyl carbanion equivalents, and their application to the syntheses of unsymmetrical hexathioorthooxalates
作者:Charles Allan Brown、Robert D. Miller、Charles M. Lindsay、Keith Smith
DOI:10.1016/s0040-4039(01)80082-4
日期:1984.1
by deprotonation of 2-(methyl-thio)-1,3-benzodithioles with n-butyllithium in THF; these anions are protonated (aqueous NH4Cl) or methylated (MeI) as expected, but undergo an unexpected, overall carbophilic addition reaction with cyclic trithiocarbonates to yield, after alkylation, unsymmetrical hexathioorthooxalates, compounds which have been difficult to prepare by traditional methods.
通过在邻苯三硫代碳酸酯中进行甲基锂的巯基加成反应或在正丁基锂中通过2-(甲硫基)-1,3-苯并二硫醇的去质子化反应,很容易生成2-Lithio-2-(甲硫基)-1,3-苯并二硫醇。 THF; 这些阴离子已按预期质子化(NH 4 Cl水溶液)或甲基化(MeI),但与环状三硫代碳酸酯进行了意想不到的整体嗜碳加成反应,烷基化后生成不对称的六硫代原草酸酯,这些化合物难以通过传统方法制备。