丙烯酸叔丁酯 、
(2S,5R)-6-Diazo-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 2,2,2-trichloro-ethyl ester 以
二氯甲烷 为溶剂,
生成 (6'
S)-3',3'-dimethyl-7'-oxo-2,4-dihydro-(5'
cH,6'
rN)-spiro[pyrazole-3,6'-(4-thia-1-aza-bicyclo[3.2.0]heptane)]-5,2'
c-dicarboxylic acid 5-
tert-butyl ester 2'-(2,2,2-trichloro-ethyl) ester 、
(6'R)-3',3'-dimethyl-7'-oxo-2,4-dihydro-(5'tH,6'rN)-spiro[pyrazole-3,6'-(4-thia-1-aza-bicyclo[3.2.0]heptane)]-5,2't-dicarboxylic acid 5-tert-butyl ester 2'-(2,2,2-trichloro-ethyl) ester