、 7-(7-((tert-butoxycarbonyl)amino)-4-isobutoxy-1,8-naphthyridine-2-carboxamido)-4-isobutoxy-1,8-naphthyridine-2-carboxylic acid 在
benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 12.0h,
以70%的产率得到7-[[hydroxy-[7-[[hydroxy-[7-[[hydroxy-[(2-methylpropan-2-yl)oxy]methylidene]amino]-4-(2-methylpropoxy)-1,8-naphthyridin-2-yl]methylidene]amino]-4-(2-methylpropoxy)-1,8-naphthyridin-2-yl]methylidene]amino]-4-(2-methylpropoxy)-N-[5-(2-methylpropoxy)-7-phenylmethoxycarbonyl-1,8-naphthyridin-2-yl]-1,8-naphthyridine-2-carboximidic acid