申请人:Learmonth David Alexander
公开号:US20110112303A1
公开(公告)日:2011-05-12
A process for preparing the S or R enantiomer of a compound of formula A,
the process comprising subjecting a compound of formula B to asymmetric hydrogenation in the presence of a chiral transition metal catalyst and a source of hydrogen, wherein X is CH
2
, oxygen, or sulphur; R
1
, R
2
and R
3
are the same or different and signify hydrogens, halogens, alkyl, alkyloxy, hydroxy, nitro, alkylcarbonylamino, alkylamino, or dialkylamino group; and R
4
is alkyl or aryl, wherein the transition metal catalyst comprises a chiral ligand having the formula
wherein p is from 1 to 6, and Ar means aryl group; wherein the term alkyl means hydrocarbon chains, straight or branched, containing from one to six carbon atoms, optionally substituted by aryl, alkoxy, halogen, alkoxycarbonyl or hydroxycarbonyl groups; the term aryl means an aromatic or heteroaromatic group, optionally substituted by alkyloxy, halogen, or nitro group; and the term halogen means fluorine, chlorine, bromine, or iodine.
一种制备化合物A的S或R对映体的方法,该方法包括将化合物B置于手性过渡金属催化剂和氢源存在下进行不对称氢化,其中X为CH2、氧或硫;R1、R2和R3相同或不同,表示氢、卤素、烷基、烷氧基、羟基、硝基、烷基羰基氨基、烷基氨基或二烷基氨基;R4为烷基或芳基,其中过渡金属催化剂包括具有以下结构的手性配体,其中p为1至6,Ar表示芳基;其中术语烷基指的是含有一至六个碳原子的烃链,直链或支链,可选择地被芳基、烷氧基、卤素、烷氧羰基或羟基羰基基团取代;术语芳基指的是芳香或杂芳基团,可选择地被烷氧基、卤素或硝基基团取代;术语卤素指的是氟、氯、溴或碘。