4,5-二氢-6-羟基-2H-萘并(1,8-bc)呋喃-2-酮 、
(2R,3S)-N-benzoyl-O-<<2-(trimethylsilyl)ethoxy>methyl>-3-phenylisoserine 以17%的产率得到(3-oxo-2-oxatricyclo[6.3.1.04,12]dodeca-1(12),4,6,8,10-pentaen-9-yl) (2R,3S)-3-benzamido-3-phenyl-2-(2-trimethylsilylethoxymethoxy)propanoate