申请人:Bayer Aktiengesellschaft
公开号:US04849531A1
公开(公告)日:1989-07-18
A process for the preparation of a 2,3-epoxyamide of the formula ##STR1## in which R.sup.1 represents hydrogen or straight-chain or branched C.sub.1 -C.sub.8 -alkyl, which may be substituted by phenyl or halogen, or represents C.sub.3 -C.sub.7 -cycloalkyl, phenyl, C.sub.1 -C.sub.8 -alkoxycarbonyl, or a group of the formula ##STR2## in which R.sup.4 and R.sup.5 are identical or different and denote hydrogen, phenyl, benzyl, acetyl or C.sub.1 -C.sub.8 -alkyl which is optionally substituted by phenyl or halogen, R.sup.2 represents hydrogen or an amino protecting group and R.sup.3 represents a radical which activates the methylene group, comprising reacting a 2-halogeno-3-hydroxyamide of the formula ##STR3## in which X represents fluorine, chlorine, bromine or iodine, with an alkali metal hydroxide in an inert solvent.
一种制备式为##STR1##的2,3-环氧酰胺的方法,其中R.sup.1代表氢或直链或支链C.sub.1-C.sub.8-烷基,可以被苯基或卤素取代,或代表C.sub.3-C.sub.7-环烷基、苯基、C.sub.1-C.sub.8-烷氧羰基或式子##STR2##中R.sup.4和R.sup.5相同或不同,表示氢、苯基、苄基、乙酰基或C.sub.1-C.sub.8-烷基,该烷基可以选择性地被苯基或卤素取代,R.sup.2表示氢或氨基保护基,R.sup.3表示激活亚甲基基团的基团,包括在惰性溶剂中将式为##STR3##的2-卤代-3-羟基酰胺与碱金属氢氧化物反应。