l-alaninals and l-serinals was investigated and high levels of asymmetric induction were achieved. Stereochemical models for rationalisation of the results obtained are proposed. cis-(2R,3S)-3-Hydroxyproline was synthesised starting from N-Cbz,O-TBS-l-serinal, in which the crucial step involves addition of allyltrimethylsilane to the aldehyde in the presence of SnCl4.
研究了
路易斯酸对将烯丙基三甲基
硅烷添加到各种受保护的l-丙
氨酸和l-
丝氨酸中的非对映选择性的影响,并实现了高
水平的不对称诱导。提出了立体
化学模型,用于合理化所获得的结果。顺式-(2 R,3 S)-
3-羟基脯氨酸从N -Cbz,O -TBS-1-
丝氨酸开始合成,其中关键步骤涉及在SnCl 4存在下向烯醛中添加烯丙基三甲基
硅烷。