聚合甲醛 、
4-(1-(2,4-dimethoxybenzyl)-3-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)guanidino)butanoic acid 、
1,4-苯二甲胺 、 3,6-dioxaoctane-1,8-diisocyanide 以
甲醇 为溶剂,
反应 2.5h,
以38%的产率得到1-[(2,4-dimethoxyphenyl)methyl]-1-[4-[18-[4-[(2,4-dimethoxyphenyl)methyl-[N'-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)sulfonyl]carbamimidoyl]amino]butanoyl]-5,16-dioxo-9,12-dioxa-3,6,15,18-tetrazabicyclo[18.2.2]tetracosa-1(22),20,23-trien-3-yl]-4-oxobutyl]-2-[(2,2,5,7,8-pentamethyl-3,4-dihydrochromen-6-yl)sulfonyl]guanidine