ethyl 2-(2-chloro-2-oxoethyl)-3,3-dimethylbutanoate 、 endo-(+/-)-7-(2-benzoxazolyl)-1,5,7-trimethyl-3-azabicyclo<3.3.1>nonan-2-one 在
正丁基锂 作用下,
生成 2-[2-((1R,5R,7R)-7-Benzooxazol-2-yl-1,5,7-trimethyl-2-oxo-3-aza-bicyclo[3.3.1]non-3-yl)-2-oxo-ethyl]-3,3-dimethyl-butyric acid ethyl ester