摘要:
The present invention pertains to a process for preparing 3-hydroxy-3-methylbutyrate (HMB) or a salt thereof, the method comprising (a) reacting isobutylene oxide with cyanide in order to obtain 3- hydroxy-3-methylbutyronitrile, and (b) hydrolyzing the 3-hydroxy-3-methylbutyronitrile obtained in step (a) in order to obtain HMB, wherein hydrolysis step (b) is performed using either at least one nitrilase enzyme or, alternatively, using a combination of enzymes, said combination comprising at least one nitrile hydratase and at least one amidase.
摘要:
A process for preparation of the compound (I) and salts thereof is provided. The process comprises reacting an alkali cyanide and paraformaldehyde to form a slurry of glycolonitrile followed by neutralizing, mixing the neutralized slurry containing glycolonitrile with an alkali ethoxide and an cyanoacetate to obtain the alkali salt of compound (I), and neutralizing the alkali salt of compound (I) to obtain the compound (I), wherein R represents a straight or branched chain alkyl having C 1 -C 18 carbon atoms.
摘要:
A process is provided for the preparation of a compound of Formula (1) wherein: R is H, optionally substituted acyl, optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl: R² and R³ each independently are H or a hydroxy protecting group; comprising the steps: (a) reacting a compound of Formula (2) in a solvent in the presence of a base with a compound of formula R SO2X to give a compound of Formula (3); wherein: R is an optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl group; and X is halogen: and (b) reacting the compound of Formula (3) with a cyanide source in the presence of a phase transfer catalyst.
摘要:
There is provided a process for the preparation of a chiral insecticidal and acaricidal compound of formula (I). Also provided are intermediate compounds useful in the process of the present invention.
摘要:
A process for making a water-soluble β-hydroxynitrile. A 1,2-epoxide and an inorganic cyanide salt are reacted in a solvent having aqueous methanol and a buffer therein to form β-hydroxynitrile. The buffer substantially inhibits the information of reaction products other than β-hydroxynitrile. Optionally, water may be removed from the β-hydroxynitrile by azeotropic distillation with acetonitrile and subsequently purified via vacuum distillation and filtraton.
摘要:
Processes for the efficient production of chiral amino nitriles are disclosed. Generally, the processes include the esterification of the alcohol of an amino protected alcohol followed by nucleophilic substitution of the ester with a cyano group. In an exemplary embodiment the chiral amino nitrile produced is (R)-3-aminopentanenitrile.
摘要:
There is provided a process for the preparation of a chiral insecticidal and acaricidal compound of formula (I). Also provided are intermediate compounds useful in the process of the present invention.
摘要:
A process is provided for the preparation of a compound of Formula (1) wherein: R 1 is H, optionally substituted acyl, optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl: R² and R³ each independently are H or a hydroxy protecting group; comprising the steps: (a) reacting a compound of Formula (2) in a solvent in the presence of a base with a compound of formula R 4 SO 2 X to give a compound of Formula (3); wherein: R 4 is an optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl group; and X is halogen: and (b) reacting the compound of Formula (3) with a cyanide source in the presence of a phase transfer catalyst.
摘要:
Processes for preparing intermediate compounds (VII) and compounds (VIII) and (XIV), which are useful as raw materials in the synthesis of antimicrobial compounds, from compounds (I) or (X) trough compounds (II); and novel compounds useful in the processes.