申请人:Yagi Kenji
公开号:US20130030193A1
公开(公告)日:2013-01-31
The present invention relates to a method comprising (A) reacting a β-keto ester with a 2-halo ester under basic conditions to obtain a 2-aceto-3-methyl-succinic acid ester; (B) reacting the resulting 2-aceto-3-methyl-succinic acid ester with methyl vinyl ketone under basic conditions, optionally followed by a decarboxylation reaction and hydrolysis, etc., to obtain an α-methyl-γ-keto acid; and (C) reducing the resulting α-methyl-γ-keto acid to obtain wine lactone or a stereoisomer thereof or a mixture thereof. Alternatively, the present invention relates to a method comprising step (A) as recited above; (B) reacting the resulting 2-aceto-3-methyl-succinic acid ester with methyl vinyl ketone under basic conditions, followed by decarboxylation reaction to obtain an α-methyl-γ-keto acid ester; and (E) reducing the resulting α-methyl-γ-keto acid ester in the presence of a ruthenium complex having a specific structure and in the presence of a hydrogen donor to obtain wine lactone or a stereoisomer thereof or a mixture thereof.
本发明涉及一种方法,包括:(A)在碱性条件下反应β-酮酯和2-卤代酯,以获得2-乙酰基-3-甲基琥珀酸酯;(B)在碱性条件下反应所得的2-乙酰基-3-甲基琥珀酸酯和甲基乙烯酮,随后可选择进行脱羧反应和水解等步骤,以获得α-甲基-γ-酮酸;(C)在还原剂的作用下还原所得的α-甲基-γ-酮酸,以获得酒内酯或其立体异构体或其混合物。另外,本发明还涉及一种方法,包括步骤(A)如上所述;(B)在碱性条件下反应所得的2-乙酰基-3-甲基琥珀酸酯和甲基乙烯酮,随后进行脱羧反应,以获得α-甲基-γ-酮酸酯;(E)在具有特定结构的铑配合物和氢供体的存在下还原所得的α-甲基-γ-酮酸酯,以获得酒内酯或其立体异构体或其混合物。