Ethyl 5-(2,4-bis(benzyloxy)-5-chlorophenyl)-3-(ethylcarbamoyl)-4,5'-biisoxazole-3'-carboxylate 、
三氯化硼 在
crude product 、 silica gel 作用下,
以to afford the title compound (7.2 mg, 0.017 mmol) in a yield of 48%的产率得到ethyl 5-(5-chloro-2,4-dihydroxyphenyl)-3-(ethylcarbamoyl)-4,5'-biisoxazole-3'-carboxylate