摘要:
The present invention discloses a process for the preparation of quetiapine, which comprises the ring closure and deprotection of a compound of the formula (I), as well as novel intermediates in the process.
摘要:
A new process for manufacturing entacapone comprising reacting 3,4-dihydroxy-5-nitrobenzaldehyde with N,N-diethyl-2-cyanoacetamide in the presence of a catalyst in a C 4 to 8 alcohol at reduced pressure and at a temperature of at least 70 °C, cooling the mixture to a temperature of 30 °C or below, seeding the mixture with N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamide comprising at least 10 % of the Z-isomer by weight in the seeding crystals, cooling the mixture to a temperature of 5 °C or below, isolating the crystallized product and converting the obtained mixture of the E- and Z-isomers of N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamide to the E-isomer (entacapone).
摘要:
The present invention is directed to novel processes for the preparation of citalopram comprising halogenation of a phthalide compound of formula II, wherein R is a suitable group to be changed to CN, to afford an acid halogenide compound of formula III wherein R is as defined above and X is halogen, and thereafter obtaining citalopram through two successive reactions with suitable organometallic halides or organoboranes or by a reaction with organometallic 4-fluorophenylhalide or 4-fluorophenylborane followed by reduction and alkylation, and an exchange of R to cyano to afford citalopram. The order of the reactions can be varied depending e.g. on the starting compound used.
摘要:
Method for the preparation of 1-(3-dimethylaminopropyl)-1-(4-fluoro- phenyl)-1,3-dihydroisobenzofuran-5-carbonitrile (citalopram) comprising the reaction of a compound of formula (III) wherein X is a halogen, with organometallic dimethylaminopropyl halide. Other aspects of the invention are new compounds of formula (II) and formula (III) and their preparation.