4-(methylsulfonyl)butanoic acid 、 {[4-(2',4'-Diamino-6'-methyl-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester 在
二苯基膦叠氮化物 、
N,N-二异丙基乙胺 作用下,
以
1,4-二氧六环 为溶剂,
以7%的产率得到4-{4',6'-Bis-[3-(3-methanesulfonyl-propyl)-ureido]-2'-methyl-biphenyl-3-sulfonyl}-5-methylsulfanyl-thiophene-2-carboxamidine trifluoroacetate