Either diastereofacial differentiation in the reaction of chiral thiomethylketones with appropriate organometallics
作者:Tamotsu Fujisawa、Isao Takemura、Yutaka Ukaji
DOI:10.1016/s0040-4039(00)97877-8
日期:1990.1
of sulfur atom instead of oxygen into α-position to ketone was found to be crucial for efficient diastereofacial differentiation; i.e., either diastereomer of tertiary alcohol could be obtained by the reaction of organometallics to chiral thiomethylketones derived from (S)-2-mercapto-2-phenylethanol and α-halo ketones. For example, MeLi attacked from si-face, while Me2Zn preferred re-facial attack. In
发现将硫原子而不是氧气引入酮的α位对于有效的非对面分化至关重要。即,可以通过有机金属与衍生自(S)-2-巯基-2-苯基乙醇和α-卤代酮的手性硫代甲基酮的反应获得任何一种叔醇的非对映异构体。例如,从将MeLi攻击SI面取向,而我2的Zn优选重新-facial攻击。另外,利用本方法成功地合成了1,2 - O-异亚丙基-2-甲基-1,2,5-戊三醇的两种对映异构体,所述对映体是合成额叶磷脂的关键中间体。