Synthesis of air-stable zwitterionic 2-phosphiniminium-arenesulfonates
摘要:
Efficient synthetic methodology for preparation of 2-phosphiniminium-5-methylbenzenesulfonate zwitterions is reported. Staudinger reaction between phosphines and n-propyl 2-azido-5-methylbenzenesulfonates followed by sulfonate ester deprotection using pyridinium tetrafluoroborate/pyridine afforded the zwitterions in excellent yields. This new route directly accesses ortho-substituted-arenesulfonate ligands that incorporate a phosphinimine, a strong sigma-donor. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis of air-stable zwitterionic 2-phosphiniminium-arenesulfonates
作者:Christopher T. Burns、Suisheng Shang、Rajesh Thapa、Mark S. Mashuta
DOI:10.1016/j.tetlet.2012.06.112
日期:2012.9
Efficient synthetic methodology for preparation of 2-phosphiniminium-5-methylbenzenesulfonate zwitterions is reported. Staudinger reaction between phosphines and n-propyl 2-azido-5-methylbenzenesulfonates followed by sulfonate ester deprotection using pyridinium tetrafluoroborate/pyridine afforded the zwitterions in excellent yields. This new route directly accesses ortho-substituted-arenesulfonate ligands that incorporate a phosphinimine, a strong sigma-donor. (C) 2012 Elsevier Ltd. All rights reserved.