A process for preparing 4-haloazetidinones of the formu-
which comprises reacting in an inert solvent at a temperature between about -20°C. and about 45°C. a 4-sulfino- azetidinone of the formula
with at least one molar equivalent of a positive halogen reagent, where in the above formulas M is hydrogen, sodium or potassium, X is chloro, bromo, or iodo; R is a carboxy-protecting group; and R, is an acylamido or diacylamido group useful as intermediates for the preparation of β-lactam antibiotics.
一种制备式-4-卤代氮杂
环丁酮的工艺
式的 4-
氨基磺氮杂
环丁酮与至少一种摩尔当量的正卤素试剂反应。
式中 M 为氢、
钠或
钾,X 为
氯、
溴或
碘;R 为羧基保护基团;R 为酰
氨基或二酰基
氨基,可用作制备 β-内酰胺类抗生素的中间体。