4-[4-((2S)-2-amino-2-tert-butoxycarbonyl-ethyl)-phenoxy]-butyric acid ethyl ester 、 5-Bromo-7-fluoro-2-(methylthio)-benzoxazole 在
Acetic acid, mercury(2+) salt (2:1) 氮气 、
ethyl acetate dichloromethane 作用下,
反应 3.0h,
以564 mg of expected product is obtained的产率得到(1,1-dimethylethyl) N-(5-bromo-7-fluoro-2-benzoxazolyl)-O-[4-oxo-4-[(1,4,5,6-tetrahydro-2-pyrimidinyl)amino]butyl]-L-tyrosinate