bis(2-isocyanatophenyl)ether 、
1,3-Bis(5-amino-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl)urea 以
乙腈 为溶剂,
反应 12.0h,
以62%的产率得到3,11,19,43-Tetratert-butyl-49,49,50,50-tetramethyl-15,31,47-trioxa-6,8,22,24,38,40-hexazanonacyclo[43.3.1.113,17.05,48.09,14.016,21.025,30.032,37.041,46]pentaconta-1(48),2,4,6,9,11,13,16,18,20,23,25,27,29,32,34,36,38,41,43,45-henicosaene-7,23,39-triol