There is provided a process for preparing a compound of formula (I) ##STR1## wherein R is H or a hydroxy protecting group, R.sub.2 is an organic residue and R.sub.3 is H or a nitrogen protecting group, which process comprises reacting together a compound of formula (II) ##STR2## wherein R.sub.1 is a C.sub.1 -C.sub.4 alkyl or a phenyl group, R and R.sub.3 are as defined above, a compound of formula (III) ##STR3## wherein R.sub.2 is as defined above and X is a cation or a silicon-containing residue, and a salt of a group IIa, IIb or transition element. The compounds of formula (I) are intermediates in the synthesis of penem antibiotics.
提供了一种制备式(I)的化合物的方法,其中R为H或羟基保护基,R.sub.2为有机残基,R.sub.3为H或氮保护基,该方法包括将式(II)的化合物与式(III)的化合物反应在一起,其中R.sub.1为C.sub.1-C.sub.4烷基或苯基,R和R.sub.3如上所述,R.sub.2如上定义,X为阳离子或含
硅残基的盐,式(I)的化合物是制备青霉烷类抗生素的中间体。