A process for preparing an optically active biaryl compound the formula (4):
wherein R*, R2, R3, n1, n2 and * are as defined hereinafter,which comprises reacting an aromatic sulfonic acid ester compound of the formula (1):
wherein
R1 is a substituted or unsubstituted alkyl or aryl group,
R2 is the same or different and represents a fluorine atom, a cyano group, a nitro group, a substituted or unsubstituted linear or branched alkyl group, etc.,
R* is the same or different and represents a substituent having at least one asymmetric carbon, or the substituents on the adjacent carbon atoms of the benzene ring may be bound each other and taken together with the benzene ring to form a fused polycyclic aromatic ring, and provided that R1 is not a trifluoromethyl group, a nonafluorobutyl group or a pentafluorophenyl group, with an organic boron compound of the formula (2):
wherein
R3 is a substituted or unsubstituted aryl or heteroaryl group, and
Q1 and Q2 are the same or different and each is a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, etc., at 70°C or below in the presence of a nickel catalyst and a base.
一种制备具有光学活性的式 (4) 双芳基化合物的工艺:
其中 R*、R2、R3、n1、n2 和 * 如下文所定义,包括使式(1)的芳香族
磺酸酯化合物反应:
其中
R1 是取代或未取代的烷基或芳基、
R2 相同或不同,代表
氟原子、
氰基、硝基、取代或未取代的直链或支链烷基等、
R* 相同或不同,代表至少有一个不对称碳的取代基,或者苯环相邻碳原子上的取代基可以相互结合,并与苯环一起形成融合的多环芳香环,只要 R1 不是三
氟甲基、无
氟丁基或
五氟苯基,具有式(2)的有机
硼化合物:
其中
R3 是取代或未取代的芳基或杂芳基,以及
Q1 和 Q2 相同或不同,且各自为羟基、具有 1 至 4 个碳原子的烷氧基等,在
镍催化剂和碱存在下,于 70°C 或以下进行反应。