Patent ID: 8354530

Claim:
A process for preparation of compound of following formula: which comprises treating a compound of following formula: wherein X is a leaving group with one or more phosphines of Formula X PR 1 R 2 R 3 wherein Het is a residue of the following formula; A is an anion of a strong organic acid, selected from the group consisting of mesyloxy, fluoroacetyloxy, and trifluoroacetyloxy; R 1 , R 2 , R 3 , are the same or different and are selected from substituted (by halo, alkyl or aryl) or unsubstituted C 1 -C 12 alkyl or C 3 -C 6 cycloalkyl or C 1 -C 8 alkenyl or C 5 -C 6 cycloalkenyl or C 5 -C 10 aryl; and X is a leaving group selected from the group consisting of mesyloxy, fluoroacetyloxy, and trifluoroacetyloxy.