The relative stereochemistry of some α-methyl-β-silylcarbonyl compounds produced by the diastereoselective alkylation of β-silylenolates
作者:Werner Bernhard、Ian Fleming
DOI:10.1016/0022-328x(84)85181-5
日期:1984.8
Conjugate addition of lithium bis(dimethylphenylsilyl)cuprate to methyl cinnamate (1), to 4-phenylbut-3-en-2-one (4), and to dec-3-en-2-one (15), followed by methylation of the intermediate enolate, gives largely one diastereoisomer of the α-methyl-β-silylcarbonyl compound (the β-silyl ester (3), 3-methyl-4-dimethyl(phenyl)silyl-4-phenylbutan-2-one (5), and 4-dimethyl(phenyl)silyl-3-methyldecan-3-one
将双(二甲基苯基甲硅烷基)锂合到肉桂酸甲酯(1),4-苯基丁-3-烯-2-酮(4)和癸-3-烯-2-酮(15)中,然后进行甲基化中间体烯醇化物的α-甲基,β-甲基-β-甲硅烷基羰基化合物的大部分非对映异构体(β-甲硅烷基酯(3),3-甲基-4-二甲基(苯基)甲硅烷基-4-苯基丁-2-(5)和4-二甲基(苯基)甲硅烷基-3-甲基癸-3-一(16)。通过酯3的转化,证明这些产品中两个手性中心的相对构型分别为(RR,SS),(RR,SS)和(RS,SR)。入酮5,并通过酮的拜尔-维利格氧化5,其非对映体(RS,SR)-3-甲基-4-二甲基(苯基)甲硅烷基-4-苯基丁-2-酮(8),以及酮16为相应的乙酸酯((RR,SS)-1-苯基-1-二甲基(苯基)甲硅烷基丙-2-基乙酸酯(9),(RS,SR)-1-苯基-1-二甲基(苯基)甲硅烷基丙酯乙酸2-基酯(12)和(RR,SS)-3-二甲基(苯基)甲硅