Synthesis of Chiral 1,3-Diamines Derived from cis-2-Benzamidocyclohexanecarboxylic Acid and Their Application in the Cu-Catalyzed Enantioselective Henry Reaction
作者:Koichi Kodama、Kazuyuki Sugawara、Takuji Hirose
DOI:10.1002/chem.201102136
日期:2011.11.25
decrease in product enantioselectivity caused by spontaneous retro‐Henry reaction, which was suppressed by conducting the reaction at 0 °C. This versatile reaction afforded various β‐nitroalcohols in excellent yields and enantioselectivities (up to 98 % yield, 91 % enantiomeric excess) under the optimized reaction conditions. The chiral induction mechanism was explained on the basis of a previously
在这项研究中,从(-)-顺式合成了13种不同的手性1,3-二胺-2-苯甲酰胺基环己烷羧酸 它们已成功地用作配体在苯甲醛和硝基甲烷之间的铜催化的不对称亨利反应中。证实了产物的对映选择性可以由两个氨基上的取代基控制。一项时程研究表明,自发逆亨利反应导致产物对映选择性降低,但在0°C进行反应可以抑制这种对映选择性。在优化的反应条件下,这种通用的反应以优异的收率和对映选择性(高达98%的收率,91%的对映体过量)提供了各种β-硝基醇。在先前提出的过渡态模型的基础上解释了手性诱导机理。