Asymmetric Synthesis of Organosilicon Compounds Using a C<sub>2</sub>Chiral Auxiliary
作者:Kimiko Kobayashi、Takayuki Kato、Masafumi Unno、Shinji Masuda
DOI:10.1246/bcsj.70.1393
日期:1997.6
Optically active silanes were synthesized by a novel asymmetric synthesis which involved the diastereoselective ring-opening reaction of 1,3-dioxa-2-silacycloheptanes bearing a C2 chiral auxiliary with Grignard reagents, followed by a lithium aluminum hydride (LiAlH4) reduction. (R)-Ethylmethylphenylsilane and (R)-methylphenylpropylsilane were derived in 93%ee and 98%ee, respectively. The preparation
光学活性硅烷是通过一种新颖的不对称合成法合成的,该合成法涉及带有 C2 手性助剂的 1,3-二氧杂环己烷-2-硅杂环庚烷与格氏试剂的非对映选择性开环反应,然后是氢化铝锂 (LiAlH4) 还原。(R)-乙基甲基苯基硅烷和(R)-甲基苯基丙基硅烷分别以93%ee和98%ee衍生。还描述了其他光学硅烷的制备。其中一些的最大转数已通过 1 H NMR 和/或毛细管 GC 方法确定。基于立体化学结果提出了非对映选择性开环反应的机制。