三光气 、
N-[5-[[N-(5-amino-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl)-C-hydroxycarbonimidoyl]amino]-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl]-N'-[2-[2-[[[[5-[[N-(5-amino-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl)-C-hydroxycarbonimidoyl]amino]-2,7-ditert-butyl-9,9-dimethylxanthen-4-yl]amino]-hydroxymethylidene]amino]phenoxy]phenyl]carbamimidic acid 在
N,N-二异丙基乙胺 作用下,
以
四氢呋喃 为溶剂,
以95%的产率得到N-[2,7-ditert-butyl-5-[[N-[2-[2-[[[[2,7-ditert-butyl-5-[[N-(2,7-ditert-butyl-5-isocyanato-9,9-dimethylxanthen-4-yl)-C-hydroxycarbonimidoyl]amino]-9,9-dimethylxanthen-4-yl]amino]-hydroxymethylidene]amino]phenoxy]phenyl]-C-hydroxycarbonimidoyl]amino]-9,9-dimethylxanthen-4-yl]-N'-(2,7-ditert-butyl-5-isocyanato-9,9-dimethylxanthen-4-yl)carbamimidic acid