T. Yasuhara et al., Chemoselective alkoxycarbonylation reagent having trifluoromethylsulfonyl-4-trifluoromethylanilide as a leaving group, J CHEM S P1, (16), 1999, pp. 2233-2234
N-Benzyloxy- and N-tert-butoxycarbonyltrifluoromethylsulfonyl-4-trifluorome
thylanilides were prepared and were found to be chemoselective and shelf-st
orable alkoxycarbonylation reagents.