The thermolysis of trichloroethyl 6-phenoxyacetamido penicillanate sulfoxide and ethyl 2-mercaptoacetate in toluene gave the unsym-azetidinone disulfide(β,γ-isomer) in 65% yield. With added catalytic amounts of N,N-dimethylaniline the α,β-isomer was the major product (60%), along with a new β-lactam cleaved product, 8 (5–6%).
在
甲苯中热分解三
氯乙基6-苯氧基乙酰胺基
青霉酸酯亚砜和2-
巯基乙酸乙酯,得到65%收率的不对称氮杂
环丁酮二
硫化物(β,γ-异构体)。加入催化量的N,N-二甲基
苯胺后,α,β-异构体是主要产物(60%),另外还有一个新的β-内酰胺裂解产物8(5-6%)。