Process for the preparation of...

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C - Chemistry, Metallurgy

07

D

C07D 498/10 (2006.01) C07D 498/20 (2006.01)

Patent

CA 2048193

HOE 90/F 231 ABSTRACT OF THE DISCLOSURE Process for the preparation of 1-oxa-3,8-diaza-4- oxospiro[4.5]decane compounds The invention relates to an environmentally friendly process for the preparation of compounds of the formula below Image in which R1 and R2 are preferably H or alkyl, R3 and R4 are preferably alkyl or cycloalkyl, R5 and R6 are preferavly hydrogen or methyl and R7 is in particular alkyl. In the process, the additional use of a phase transfer catalyst can be dispensed with without loss in yield.

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