Alkyl 2,2,2-Trifluoroethanesulfonates (Tresylates): Elimination−Addition vs Bimolecular Nucleophilic Substitution in Reactions with Nucleophiles in Aqueous Media<sup>1</sup>
作者:James F. King、Manjinder S. Gill
DOI:10.1021/jo9610366
日期:1996.1.1
product studies are consistent with the following: (a) the reaction of tresylates with water is the normal sulfonic ester hydrolysis and (b) reaction with hydroxide is an (E1cB)(rev) process with loss of HF to yield the alkyl 2,2-difluoroethenesulfonate, ROSO(2)CH=CF(2), which rapidly yields the observed products. Benzyl 2,2,2-trifluoroethyl sulfone reacts analogously. The relationship between these observation
烷基2,2,2-三氟乙烷磺酸酯(三氟甲磺酸酯),ROSO(2)CH(2)CF(3),与碱水溶液(pH> / = 9)反应,得到(烷氧基磺酰基)乙酸,ROSO(2) CH(2)COOH; 进一步添加伯胺或仲胺或链烷硫醇后,产物即为相应的酰胺,ROSO(2)CH(2)C(O)NR(1)R(2)或乙烯酮二硫缩醛ROSO(2)CH = C(SR(1))(2)或硫原酸酯ROSO(2)CH(2)C(SR(1))(3)可能占主导地位。动力学和产物研究与以下各项相符:(a)巯基磺酸盐与水的反应是正常的磺酸酯水解,(b)与氢氧化物的反应是(E1cB)(rev)过程,但失去了HF生成烷基2 ,2-二氟乙烯磺酸盐,ROSO(2)CH = CF(2),可快速产生所观察到的产物。苄基2,2,2-三氟乙基砜的反应类似。