| 摘要 |
A method for the preparation of citalopram comprising the steps of reacting a compound of Formula (IV) wherein R1 is C1-6 alkyl and X is O or NH, successively with a Grignard reagent of 4-halogen-fluorophenyl and a Grignard reagent of 3-halogen-N,N-dimethyl-propylamine, respectively, effecting ringclosure of the resulting compound of Formula (V) wherein R1 and X are as defined above, and converting the resulting 1,3-dihydroisobenzofuran compound to the corresponding 5-cyano derivative, i.e. citalopram. (IV) (V) |
