Process for the preparation of...

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C - Chemistry, Metallurgy

07

J

C07J 73/00 (2006.01) C07J 41/00 (2006.01)

Patent

CA 2091983

2091983 9302096 PCTABS00019 The preparation of a compound of formula (I) wherein X is oxygen or sulphur; R1 is hydrogen or C1-C6 alkyl; each of R2 and R3 is, independently, hydrogen, C1-C6 alkyl, C5 or C6 cycloalkyl or C6-C9 cycloalkylalkyl; R4 is hydrogen, C1-C6 alkyl, C5 or C6 cycloalkyl, C6-C9 cycloalkylalkyl or aryl; and the symbol ----- represents a single or a double bond; by a multistep process is disclosed.

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