N-[4-(Carboxy)benzyl]-N,N'-bis[(2-triphenylmethyl-thio)ethyl]glycinamide N-hydroxysuccinimide ester 、 在
TEA 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以53%的产率得到2-[(5S,11S,14R)-11-(3-carbamimidamidopropyl)-12-methyl-4,7,10,13,16-pentaoxo-19-[6-[[4-[[[2-oxo-2-(2-tritylsulfanylethylamino)ethyl]-(2-tritylsulfanylethyl)amino]methyl]benzoyl]amino]hexanoylamino]-14-propan-2-yl-3,6,9,12,15-pentazabicyclo[15.3.1]henicosa-1(21),17,19-trien-5-yl]acetic acid