[EN] PROCESS FOR THE PREPARATION OF UNSATURATED ESTERS<br/>[FR] PROCEDE DE PREPARATION D'ESTERS NON SATURES
申请人:AVECIA LTD
公开号:WO2004052823A1
公开(公告)日:2004-06-24
A process for the preparation of an unsaturated ester of Formula (1); wherein: R1 and R2 are each independently hydroxy protecting groups; R3 is optionally substituted C,_18alkyl; R4 is an organic group; and R5 is H, an organic group or R4 and R5 together with the C atom to which they are attached form a ring which is a component of an organic group; which comprises reacting a compound of Formula (2); wherein R1, R2 and R3 are as defined above; with an oxidising agent in the presence of a compound of formula R4-CHR5-Y wherein R4 and R5 are as defined above and Y represents a group forming a Wittig reagent; a P, As or Sb-containing Horner-Wadsworth Emmons reagent; a P(III), As (III) or Sb(III) precursor of a Horner-Wadsworth Emmons reagent; a Warren reagent; or a ylid precursor; and optionally a base.