1,3-Bis(5-amino-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl)urea 、 2,7-Di-tert-butyl-4,5-diisocyanato-9,9-dimethyl-9H-xanthene 在
三氟乙酸 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 12.25h,
以37%的产率得到3,11,19,27,35,43-Hexatert-butyl-49,49,50,50,51,51-hexamethyl-15,31,47-trioxa-6,8,22,24,38,40-hexazadecacyclo[43.3.1.113,17.129,33.05,48.09,14.016,21.025,30.032,37.041,46]henpentaconta-1(48),2,4,6,9,11,13,16,18,20,22,25,27,29,32,34,36,39,41,43,45-henicosaene-7,23,39-triol