摘要:
A compound of formula (I), wherein R1 is hydrogen or a hydroxyl protecting group; and R2 and R3 are same or different and are independently selected from halogen or —O—SO2—X; wherein X is —C1-C4 alkyl; C1-C4 alkyl substituted with one or more halogen; or substituted or unsubstituted phenyl wherein said phenyl substituent is selected from halogen, nitro and C1-C4 alkyl; provided that when R3 is bromine, X is not p-toluoyl; and a process for the preparation thereof.
摘要:
A compound of formula (I), wherein R1 is hydrogen or a hydroxyl protecting group; and R2 and R3 are same or different and are independently selected from halogen or —O—SO2—X; wherein X is —C1-C4 alkyl; C1-C4 alkyl substituted with one or more halogen; or substituted or unsubstituted phenyl wherein said phenyl substituent is selected from halogen, nitro and C1-C4 alkyl; provided that when R3 is bromine, X is not p-toluoyl; and a process for the preparation thereof.
摘要:
The present invention relates to a process for the asymmetric hydrogenation of imines with hydrogen under elevated pressure in the presence of a catalyst system. In particular the present invention relates to the use of the said catalytic system for the enantioselective hydrogenation of prochiral ketimines to asymmetric amines leading to the formation of herbicides.
摘要:
The present invention relates to a process for the asymmetric hydrogenation of imines with hydrogen under elevated pressure in the presence of a catalyst system. In particular the present invention relates to the use of the said catalytic system for the enantioselective hydrogenation of prochiral ketimines to asymmetric amines leading to the formation of herbicides.