An aldol reaction in an aqueous solution between an aldehyde represented by the following formula (I): R—CHO  (I) (wherein R is a hydrocarbon group which may have an substituent), and a silicon enolate represented by the following formula (II): (wherein R1 and R2 are a hydrogen atom or an aliphatic hydrocarbon group, at least one of them being an aliphatic hydrocarbon group; and R3 is a substituent selected from the group consisting of an aliphatic hydrocarbon group, an aromatic hydrocarbon group and a sulfur-containing substituent, wherein R2 and R3 may be combined with each other to form a ring) is performed so as to generate diastereoselectivity by using FeCl3, which is a low-cost Lewis acid, and a surfactant.