(E)-3-[{4-Chloro-2-[hydroxy-(2,4,6-trimethoxy-phenyl)-methyl]-phenyl}-(2,2-dimethyl-propyl)-carbamoyl]-acrylic acid ethyl ester 在
potassium carbonate 作用下,
以
乙醇 为溶剂,
以80%的产率得到[(3S,5R)-7-Chloro-1-(2,2-dimethyl-propyl)-2-oxo-5-(2,4,6-trimethoxy-phenyl)-1,2,3,5-tetrahydro-benzo[e][1,4]oxazepin-3-yl]-acetic acid ethyl ester