Process for production of 6-amino-2,2-dimethyl-3-(5-tetrazolyl)penam and
申请人:Pfizer Inc.
公开号:US03994939A1
公开(公告)日:1976-11-30
A chemical process which comprises reacting 6-(2-phenylacetamido)- or 6-(2-phenoxyacetamido)-2,2-dimethyl-3-(5-tetrazolyl)penams and certain derivatives thereof which carry a blocking or pseudo blocking group on the tetrazolyl moiety with a halogenating agent at or below 0.degree. C. to form the corresponding imino halide, followed by reaction of the imino halide with an alcohol below about -20.degree. C. to form the corresponding imino ether, and hydrolyzing the imino ether under acid conditions. The preparation of the starting 6-acyl-2,2-dimethyl-3-(5-tetrazolyl)penams is described.
4-Bromomethyl-5-methyl-1,3-dioxolen-2-one, and a process for the production thereof
申请人:KANEBO, LTD.
公开号:EP0237084A2
公开(公告)日:1987-09-16
The invention describes 4-broimomethyl-5-methyl-1, 3-dioxolen-2-one which is useful as a protective group-introducing agent for introducing protective groups into reagents in various chemical reactions, or as a modifier for prodrug preparation in medicine. The above compound can be prepared by reacting 1.0 mole of 4, 5-dimethyl-1, 3-dioxolen-2-one with 0.87-1.19 mole of N-bromosuccinimide or N-bromophthalimide.