摘要:
A laboratory scale low temperature apparatus (1) for carrying out laboratory scale low temperature chemical reactions comprises an insulated pressure container (2) for a coolant, in this case liquid nitrogen at less than minus 1960C, and a reaction vessel (3) in the form of a silvered, vacuum jacketed borosilicate glass vessel in which low temperature reactions are carried out. An outlet (5) from the coolant container (2) is connected to an in-line heater 8 in which the coolant is heated. The in-line heater (8) is connected to a contact heat exchanger (12) in the form of a spiral coil extending into the reaction vessel (3). The temperature in the vessel (3) is monitored by a sensor (25) which provides a signal to a controller which is also connected to the in-line heater (8) to maintain the target temperature in the vessel (3).
摘要:
A process for preparing a compound of formula (I): comprises reacting a 1,4-diketone of the formula (II): with a primary amine of the formula (III): wherein R 1 and R 2 may be the same or different and are selected from any one or more of H; C 1 -C 6 alkyl which may be straight or branched, substituted or unsubstituted with a halogen group; C 1 -C 6 alkoxy group; or R 1 and R 2 together represent an alkylidene group of the formula CR a R b wherein R a and R b may be the same or different and are selected from any one or more of a C 1 -C 11 alkyl group, and R 3 is selected from any one or more of a C 1 -C 6 alkyl group, in the presence of a catalyst, the catalyst comprising a salt wherein the salt comprises an amine salt or an inorganic salt of an organic acid.
摘要:
Atorvastatin lactone is prepared by hydrogenating tert-butyl isopropylidene nitrile to tert-butyl isopropylidene amine and condensing the amine with the diketone of atorvastatin to form acetonide ester. The diol protecting acetonide ester is deprotected to form a diol ester by dissolving the acetonide ester in methanol and treating with an acid. The diol ester is saponified to form a sodium salt. Methanol is removed from the reaction mixture by distillation. The sodium salt is reacidified to the free diol acid and atorvastatin lactone is formed from the diol acid. The atorvastatin lactone is directly dried without further purification.
摘要:
A one pot process for preparing l-(aminomethyl)-cyclohexaneacetic acid or pharmaceutically acceptable salts thereof comprises the steps of hydrolysing 1-cyanocyclohexaneacetic acid ethyl ester with a potassium, sodium or lithium hydroxide to form a salt of 1-cyanocyclohexaneacetic acid; in-situ hydrogenating the salt of 1-cyanocyclohexaneacetic acid in the presence of a catalyst to form the salt of l-(aminomethyl)-cyclohexaneacetic acid; and isolating l-(aminomethyl)-cyclohexaneacetic acid.
摘要:
The diketone of atorvastatin is prepared by first washing a reaction vessel with a non-ketonic solvent, especially tetrahydrofuran, to remove water. 4- fluorobenzaldehyde is then reacted with benzylidine isobutyryl acetanilide in the reaction vessel to form 4-fluoro-alpha-(2-methyl-l-oxopropyl)-gamma-oxo-N,beta- diphenylbenzene-butanamide