Process for the preparation of enantiomerically pure 1-substituted-3-aminoalcohols
申请人:Lonza AG
公开号:US08258338B2
公开(公告)日:2012-09-04
A process for the preparation of N-monosubstituted β-aminoalcohol sulfonates of formula (Ia), (Ib):
wherein R1 is C6-20-aryl or C4-12-heteroaryl, each optionally being substituted with one or more halogen atoms and/or one or more C1-4-alkyl or C1-4-alkoxy groups, R2 is C1-4-alkyl or C6-20-aryl, each aryl optionally being substituted with one or more halogen atoms and/or one or more C1-4-alkyl or C1-4-alkoxy groups and wherein R3 is selected from the group consisting of C1-18-alkyl, C6-20-cycloalkyl, C6-20-aryl and C7-20-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 R1, R2 and R3 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为C6-20芳基或C4-12杂芳基,每个芳基可以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,每个芳基可以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,其中R3选自由C1-18烷基,C6-20环烷基,C6-20芳基和C7-20芳基烷基残基的群。该方法包括以下步骤:(a)在压力高于1.5 bar的情况下,在有机溶剂中(有机溶剂可以包含水),将甲基酮,一级胺,甲醛和磺酸反应,制备公式(II)的N-单取代β-氨基酮磺酸盐:其中R1,R2和R3如上所定义,以及(b)在极性溶剂中,在碱和过渡金属催化剂和二膦配体的存在下,选择性地氢化磺酸盐,可以在水的存在下进行。