some 4'-n-acyl analogs of sorbistin ( 1e approximately 1t ) have been synthesized by 4'-n-acylation of 3 with an appropriate reactive derivative of carboxylic acids ( mixed anhydride , acid chloride or activated ester ) followed by deblocking of the protected group with bromine or sodium nitrite .
C0007066
carboxylic acids
C0014898
ester