Sulfonic Acid Libraries Attained Through Opening of 2-Sulfobenzoic Acid Anhydride
作者:Richard�I. Robinson、John�C. Stephens、Steve�M. Worden、Alexander�J. Blake、Claire Wilson、Simon Woodward
DOI:10.1002/ejoc.200400562
日期:2004.11
2-Sulfobenzoic acid anhydride opens cleanly with N-Boc-protected α-amino alcohols to afford zwitterionic esters 1,2-C6H4(SO3−)(CO2CH2CHR1NH3+) (R1 = H, alkyl), the species R1 = iPr is crystallographically characterised. Dehydration of these species affords zwitterionic oxazoline sulfonic acid derivatives 1,2-C6H4(SO3−)(CA=NH+CHR1CH2OA) (CA and OA are bonded C−O) for R1 = iPr (X-ray), iBu, tBu, CH2Ph
2-磺基苯甲酸酐与 N-Boc 保护的 α-氨基醇完全打开,得到两性离子酯 1,2-C6H4(SO3−)(CO2CH2CHR1NH3+)(R1 = H,烷基),R1 = iPr 是晶体学特征。这些物质的脱水得到两性离子恶唑啉磺酸衍生物 1,2-C6H4(SO3-)(CA=NH+CHR1CH2OA)(CA 和 OA 键合为 C-O),R1 = iPr(X 射线)、iBu、tBu, CH2Ph。与水反应再生两性离子酯,同时暴露于 M(OAc)2 (M = Cu, Pd) 导致形成结晶学表征的复合物 MIIL2 (L = iPr-恶唑啉磺酸的阴离子)。用 R2NH2 [R2 = CH2Ph, CH2(1-C10H7), R-CH(Me)Ph] 加热两性离子酯或恶唑啉,导致 SN2 攻击恶唑啉亚甲基基团,导致酰胺磺酸 1,2-C6H4(CONHCHRCH2NHR2)(SO3H) 基于对 R1 = iPr、R2