A process for the preparation of N-monosubstituted β-aminoalcohol sulfonates of formula (1a), (1b):
wherein R
1
is C
6-20
-aryl or C
4-12
-heteroaryl, each optionally being substituted with one or more halogen atoms and/or one or more C
1-4
-alkyl or C
1-4
-alkoxy groups, R
2
is C
1-4
-alkyl or C
6-20
-aryl, each aryl optionally being substituted with one or more halogen atoms and/or one or more C
1-4
-alkyl or C
1-4
-alkoxy groups, and wherein R
3
is selected from the group consisting of C
1-18
-alkyl, C
6-20
-cycloalkyl, C
6-20
-aryl and C
7-20
-aralkyl residues; including a) reacting a methyl ketone, a primary amine, formaldehyde and a sulfonic acid, at a pressure above 1.5 bar, optionally in a organic solvent, said organic solvent which can include water to provide N-monosubstituted β-aminoketone sulfonates of formula (II):
wherein R
1
, R
2
and R
3
are as defined above, and b) asymmetrically hydrogenating.
一种制备式(1a)、(1b)的N-单取代β-
氨基醇
磺酸盐的方法,其中R1为C6-20芳基或C4-12杂芳基,每个芳基可选择性地被一个或多个卤素原子和/或一个或多个C1-4烷基或C1-4烷氧基取代,R2为C1-4烷基或C6-20芳基,每个芳基可选择性地被一个或多个卤素原子和/或一个或多个C1-4烷基或C1-4烷氧基取代,而R3从C1-18烷基、C6-20环烷基、C6-20芳基和C7-20芳基烷基残基中选择;包括a)在压力高于1.5巴的条件下,选择性地在有机溶剂中反应甲基酮、一级胺、
甲醛和
磺酸,所述有机溶剂可包括
水,从而提供式(II)的N-单取代β-
氨基酮
磺酸盐:其中R1、R2和R3如上所定义;b)不对称氢化。