申请人:Farmitalia Carlo Erba
公开号:US04269771A1
公开(公告)日:1981-05-26
A process is disclosed for the preparation of compounds of formula I: ##STR1## wherein R is hydrogen, lower alkyl, trichloroethyl, benzyl, p-nitrobenzyl, acetoxymethyl, pivaloyloxymethyl, phthalidyl, or a --CH(CH.sub.3)OCOOEt group; R.sup.1 is --CH.sub.2 OH, --CHO, --CH.sub.2 SH, --CH.sub.2 NH.sub.2, --CH.sub.2 OCOR.sup.2, --COOR.sup.2, --CH.sub.2 NHCOR.sup.2, --CH.sub.2 OR.sup.3, or --CH.sub.2 SR.sup.4 where R.sup.2 is a lower alkyl, aryl or a heterocyclic ring, R.sup.3 is a lower alkyl, benzyl, or trityl, and R.sup.4 is a five- or six-member heterocyclic ring containing one or more heteroatoms, which comprises reacting a 4-acetoxy azetidinone with a .beta.-thioketoester to form a mixture, reacting said mixture with thionyl chloride followed by reaction with a phosphine and a base, ozonolyzing and heating to obtain the compounds of formula I.
本发明公开了一种制备I式化合物的方法:##STR1##
其中R为氢、低碳基、三氯乙基、苄基、对硝基苄基、乙酰氧甲基、季戊酰氧甲基、邻苯二甲酰亚甲基或--CH(CH.sub.3)OCOOEt基团;R.sup.1为--CH.sub.2 OH、--CHO、--CH.sub.2 SH、--CH.sub.2 NH.sub.2、--CH.sub.2 OCOR.sup.2、--COOR.sup.2、--CH.sub.2 NHCOR.sup.2、--CH.sub.2 OR.sup.3或--CH.sub.2 SR.sup.4,其中R.sup.2为低碳基、芳基或杂环环;R.sup.3为低碳基、苄基或三苯甲基;R.sup.4为含有一个或多个杂原子的五元或六元杂环,其包括将4-乙酰氧基氮杂环与β-硫代酮酯反应以形成混合物,将所述混合物与氯化硫酰反应,然后与膦和碱反应,臭氧化和加热以获得I式化合物的步骤。