Patent ID: 7842690

Claim:
A process for the manufacture of a compound of formula (II): in which R 3 and R 4 each independently represent hydrogen or C 1-6 alkyl; p represent 0; and R represents a five- or six-membered substituted or substituted unsaturated ring selected from: wherein R 1 and R 2 together represent an oxo group, or R 1 and R 2 each represent hydrogen, methoxy or ethoxy, or R 1 and R 2 together with the interiacent carbon atom represent a 1,3-dioxolane or 1,3-dioxane ring, attached via the 2 position and optionally bearing one or more methyl or ethyl groups, by the reaction of a compound of formula (VI) or (VIA) with a compound of formula (VII): in which X is O and R 1 , R 2 , R 3 , and R 4 are as defined with respect to formula (II).