5,11,17,23-tert-butyl-25,27-bis(chlorocarbonylmethoxy)-26,28-hydroxycalix[4]arene 、
2-[2-[2-[(2S)-2-amino-3-methylbutanoyl]oxyethoxy]ethoxy]ethyl (2S)-2-amino-3-methylbutanoate 在
三乙胺 作用下,
以
二氯甲烷 、
乙酸乙酯 为溶剂,
以15%的产率得到(7S,20S)-28,34,40,45-tetratert-butyl-49,50-dihydroxy-7,20-di(propan-2-yl)-3,9,12,15,18,24-hexaoxa-6,21-diazahexacyclo[24.15.7.132,36.143,47.02,38.025,30]pentaconta-1,25,27,29,32(50),33,35,38,40,43,45,47(49)-dodecaene-5,8,19,22-tetrone