Process for the preparation of 7.alpha.-alkoxycephem...

Details Process for the preparation of 7.alpha.-alkoxycephem... Process for the preparation of 7.alpha.-alkoxycephem...

C - Chemistry, Metallurgy

07

D

C07D 501/04 (2006.01) C07D 501/00 (2006.01)

Patent

CA 2083143

There is provided a process for preparing a compound of formula (I), wherein R1 is an organic residue, R2 is a hydrogen or a chlorine atom, a methoxy, ethoxy or an acetoxy group, and n represents 0, 1 or 2. The process comprises reacting a com- pound of formula (II), wherein R2 and n are as defined above, with an inorganic or organic nitrite, in an alcohol R1OH, wherein R1 is as defined above, or in a mixture R1OH-organic solvent in the presence of an inorganic or organic acid. The compounds of formula (I) are known intermediates in the synthesis of human leucocyte elastase inhibitors (HLE).

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