ethyl (12E)-18-amino-19-nitro-10,15-dioxa-2,17,20-triazatricyclo[14.3.1.15,9]henicosa-1(20),5(21),6,8,12,16,18-heptaene-2-carboxylate 在
titanium(III) chloride 作用下,
以
四氢呋喃 为溶剂,
以62%的产率得到(11E)-17-amino-9,14-dioxa-1,16,19,22-tetrazatetracyclo[13.5.2.14,8.018,21]tricosa-4(23),5,7,11,15,17,21-heptaen-20-one