A process for preparing an .alpha.-hydroxycarboxylate represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom or a lower alkyl group; R.sup.2 represents a lower alkyl group, a phenyl group or a cycloalkyl group, or R.sup.1 and R.sup.2 are bonded to each other to form a five- to seven-membered cycloalkenyl or bicycloalkenyl ring which may be substituted with a lower alkyl group; and R.sup.3 represents a lower alkyl group, which comprises reacting an olefin compound represented by formula (II): ##STR2## wherein R.sup.1 ' represents a hydrogen atom or a lower alkyl group; and R.sup.2 ' represents a lower alkyl group, a phenyl group or a cycloalkyl group, or R.sup.1 ' and R.sup.2 ' are bonded to each other to form a five- to seven-membered cycloalkyl or bicycloalkyl ring which may be substituted with a lower alkyl group, with a glyoxylate represented by formula (III): ##STR3## wherein R.sup.3 is as defined above, in the presence of a binaphthol-titanium complex represented by formula (IV): ##STR4## wherein X represents a chlorine atom or bromine atom.
一种制备式(I)所代表的α-羟基
羧酸的方法:其中,R1代表氢原子或低碳基;R2代表低碳基,苯基或环烷基,或R1和R2相互连接形成五元至七元环烯基或双环烯基环,其可以被低碳基取代;R3代表低碳基。该方法包括将式(II)所代表的烯烃化合物与式(III)所代表的乙酰
乙酸盐在双
萘酚钛配合物(IV)的存在下反应,其中,R1'代表氢原子或低碳基;R2'代表低碳基,苯基或环烷基,或R1'和R2'相互连接形成五元至七元环烷基或双环烷基环,其可以被低碳基取代;R3如上所定义;配合物(IV)表示为:其中,X代表
氯原子或
溴原子。