Stereodivergent Synthesis through Catalytic Asymmetric Reversed Hydroboration
作者:Tao-Tao Gao、Wen-Wen Zhang、Xin Sun、Hou-Xiang Lu、Bi-Jie Li
DOI:10.1021/jacs.8b13520
日期:2019.3.20
The control of chemo-, regio-, diastereo-, and enantioselectivity is a central theme in organic synthesis. The capability to obtain the full set of stereoisomers of a molecule would significantly enhance the efficiency for the synthesis of natural product analogues and creation of chiral compound libraries for drug discovery. Despite the tremendous progress achieved in the field of asymmetric synthesis
化学选择性、区域选择性、非对映选择性和对映选择性的控制是有机合成的中心主题。获得分子的全套立体异构体的能力将显着提高合成天然产物类似物和创建用于药物发现的手性化合物库的效率。尽管过去几十年在不对称合成领域取得了巨大进步,但在催化剂控制的反应中精确控制相对和绝对构型,从而产生多个立体中心仍然是一个重大的合成挑战。我们在这里报告了具有迄今为止无法实现的选择性的催化剂控制的硼氢化反应的发展。Rh 催化的 α, β-不饱和羰基化合物与频哪醇硼烷的硼氢化反应以高水平的区域-、非对映-、和对映选择性提供具有两个邻位立体中心的硼氢化产物。Through the appropriate choice of substrate geometry ( E or Z) and ligand enantiomer ( S or R), all the possible diastereoisomers are readily
A facile microwave assisted synthesis of spiro-1,3-oxazines from N-(2-(cyclohex-1-en-1-yl)ethyl)amides
developed for the synthesis of spiro-1,3-oxazine derivatives by the microwave assisted cyclization of N-2-(1′-cyclohexenyl)ethyl-acetamides/benzamides. The reaction was catalyzed by in situ generated trimethylsilyl iodide and featured by its very short reaction time. The starting materials were easily obtained by the condensation of substituted acetic/benzoic acids with 2-(1′-cyclohexenyl)ethyl amine.