| 摘要 |
There is provided a process for preparing a compound of formula (I) <CHEM> wherein R is H or a hydroxy protecting group, R2 is an organic residue and R3 is H or a nitrogen protecting group, which process comprises reacting together a compound of formula (II) <CHEM> wherein R1 is a C1-C4 alkyl or a phenyl group, R and R3 are as defined above, a compound of formula (III) <CHEM> wherein R2 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. |
