申请人:Shell Oil Company
公开号:US04665197A1
公开(公告)日:1987-05-12
The invention provides a process for preparing azetidine-3-carboxylic acid or salts thereof; useful as chemical hybridizing agents, which comprises treating a compound of the formula ##STR1## wherein R represents a hydrogen atom or a group of formula R.sup.1 R.sup.2 CH-- wherein R.sup.1 and R.sup.2 are independently selected from hydrogen, alkyl or optionally substituted phenyl moieties, with nitric acid and subjecting the resulting initial product to acid conditions to produce an acid-addition salt of azetidine-3-carboxylic acid, and thereafter, if desired, converting the acid-addition salt to the free acid or another salt of the acid, 1-nitrosoazetidine-3,3-dicarboxylic acid, 1-nitrosoazetidine-3-carboxylic acid and salts thereof being intermediates in the process.
本发明提供了一种制备3-氨基四氢噁唑-3-羧酸或其盐的方法;该方法适用于化学杂交剂,包括将式为##STR1##的化合物,其中R表示氢原子或式为R.sup.1 R.sup.2 CH-的基团,其中R.sup.1和R.sup.2分别选择氢、烷基或选择性取代的苯基官能团,用硝酸处理,然后将所得的初级产物置于酸性条件下,以产生3-氨基四氢噁唑-3-羧酸的酸加成盐,然后,如果需要,将酸加成盐转化为自由酸或酸的另一种盐,1-亚硝基3,3-二羧基四氢噁唑酸,1-亚硝基3-羧基四氢噁唑酸及其盐是该过程的中间体。