The invention relates to an improved process for the preparation of an advanced synthetic intermediate of ACE inhibitors. In one aspect, the present invention is based on a novel process for the preparation of an aldehyde of formula (I), wherein (N)
PrG
is a protected amino group, R is an alkyl or aralkyl group and X
1-4
are each independently H or a non-reacting substituent, which comprises hydroformylation of an α-olefin of formula (II), by reaction with syngas (CO/H
2
) in the presence of, as catalyst, a group VIII transition metal complex of a phosphorus-containing ligand. Aldehyde (I), the product of linear hydroformylation, is formed in preference to aldehyde (III). In another aspect of the invention, α-olefin (II) is a novel composition. The process to convert (II) to (I) enables an efficient manufacturing route to MDL 28,726 and analogues.
本发明涉及一种改进的制备ACE
抑制剂的先进合成
中间体的方法。在一方面,本发明基于一种新颖的制备式(I)醛的方法,其中(N)PrG是受保护的
氨基基团,R是烷基或芳基烷基基团,X1-4分别独立地为H或非反应性取代基,包括通过与合成气(CO/H2)反应,在含有含
磷配体的8族过渡
金属配合物的
催化剂存在下,对式(II)的α-
烯烃进行
氢甲酰化。线性
氢甲酰化产物(I)的醛优先形成,而非醛(III)。在本发明的另一方面,α-
烯烃(II)是一种新的组合物。将(II)转化为(I)的过程使MDL 28,726和类似物的有效制造路线成为可能。