2,3,9,10-Dibenzo-6,13-dihydroxy-14-crown-4 、
1-oxyl-3-bromo-2,2,5,5-tetramethyl-Δ3-pyrrolin-4-carboxylic acid chloride 在
吡啶 作用下,
以69%的产率得到Ester of 2,3,9,10-dibenzo-6,13-dihydroxy-14-crown-4 and 1-oxyl-3-bromo-2,2,5,5-tetramethyl-Δ3-pyrroline-3-carboxylic acid