Aminolysis and hydrolysis of sulphamate esters: Substantial N?S bonding in the transition state leading to N?sulfonylamines
作者:William J. Spillane、Geraldine Hogan、Paul McGrath
DOI:10.1002/poc.610080907
日期:1995.9
−ONp and sometimes also by the disapperance of ester. The reaction was found to be independent of amine type and concentration and at the high pHs that obtain the substrate esters are fully ionized. A Hammett ρacyl of −;1·8 was obtained for the decomposition of the sulphamate anions and this is consistent with substantial NS bonding in the transition state leading to N-sulphonylamine, RNSO2. This intermediate
的几个氨基磺酸酯的氨解和水解,RNHSO 2 ONP(R =的PhCH 2中,Ph,4-MEC 6 ħ 4 4,3-MEC 6 ħ 4,4-FC 6 H ^ 4,4-CLC 6 ħ 4,3在各种温度下于50%(v / v)的乙腈水溶液中研究了-ClC 6 H 4,H; Np = 4-NO 2 C 6 H 4)。与胺(R酯的反应1 NH 2)给出- ONP和两个硫酰胺,(RNHSO 2 NHR 1)和氨基磺酸盐(RNHSO 2 O - R 1 NH 3 +)产物。一阶速率通过的外观来确定- ONP有时也通过酯的disapperance。发现该反应不依赖于胺的类型和浓度,并且在高pH下获得的底物酯被完全离子化。获得了-; 1·8的哈米特ρ酰基用于氨基磺酸根阴离子的分解,这与在过渡态下产生N-磺酰胺RN SO 2的大量N S键合是一致的。然后该中间体非常迅速地分配,并与R 1 NH 2和H反应2