Process for the Preparation of Enantiomerically Pure 1-Substituted-3-Aminoalcohols
申请人:Brieden Walter
公开号:US20090156833A1
公开(公告)日:2009-06-18
A process for the preparation of N-monosubstituted β-aminoalcohol sulfonates of formula (Ia), (Ib):
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. The process has the steps of (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, the organic solvent optionally containing water, to afford N-monosubstituted β-aminoketone sulfonates of formula (II):
wherein R
1
, R
2
and R
3
are as defined above, and (b) asymmetrically hydrogenating. The sulfonates in the presence of a base and a catalyst of a transition metal and a disphosphine ligand, in a polar solvent, optionally in the presence of water.
一种制备公式(Ia),(Ib)的N-单取代β-氨基醇磺酸盐的方法:其中R1是C6-20芳基或C4-12杂芳基,每个选项可用一个或多个卤素原子和/或一个或多个C1-4烷基或C1-4烷氧基置换,R2是C1-4烷基或C6-20芳基,每个芳基可用一个或多个卤素原子和/或一个或多个C1-4烷基或C1-4烷氧基置换,其中R3选自由C1-18烷基,C6-20环烷基,C6-20芳基和C7-20芳基烷基残基组成的群。该过程的步骤为:(a)在压力大于1.5巴的情况下,将甲基酮,一级胺,甲醛和磺酸反应,可选地在有机溶剂中,所述有机溶剂可选地包含水,以得到公式(II)的N-单取代β-氨基酮磺酸盐:其中R1,R2和R3如上所述,以及(b)在极性溶剂中,在碱和过渡金属和双膦配体的催化剂存在下,可选地在水的存在下,对磺酸盐进行不对称氢化。