VITAMIN A SYNTHESIS PROCESS

摘要

The invention relates to a process for the preparation of a compound of formula (I) in which R1 is chosen from H and alkyls, R2 is chosen from H, alkyls, OR 'where R' is chosen from alkyls, silyls , CO-alkyl, R3 is chosen from acyl groups of CO (R '') type, and CO (OR "), CO (NR '' R '' '), PO (OR' ') (OR') groups ''), PO (OR '') (R '' ') where R' 'and R' '', independently of each other, are chosen from H and alkyls, R represents a group C (R4 ) = C (R5) (R6) where R4, R5 and R6, independently of each other, are selected from H, alkyls and alkenyls, linear or cyclic, aryls, alkylaryls, or R4 and R5 together form a ring, saturated or unsaturated, substituted or unsubstituted, from a compound of formula (II) or from a compound of formula (III) in which, R, R1, R2 and R3 have the definition above.