Highly Enantioselective Acylation of Acyclic <i>Meso</i> 1,3-Diols through Synergistic Isothiourea-Catalyzed Desymmetrization/Chiroablative Kinetic Resolution
作者:Jérémy Merad、Prashant Borkar、Tracy Bouyon Yenda、Christèle Roux、Jean-Marc Pons、Jean-Luc Parrain、Olivier Chuzel、Cyril Bressy
DOI:10.1021/acs.orglett.5b00707
日期:2015.5.1
general and highly efficient organocatalyzed desymmetrization of acyclic meso 1,3-diols through acyl transfer using chiral isothioureas is described. The introduction of π-systems in the acyclic substrates provided new opportunities in terms of reactivity, enantioselectivity and synthetic potential. To reach this high level of enantioselectivity (up to er >99:1), the reaction proceeds through a synergistic
描述了使用手性异硫脲通过酰基转移对无环内消旋1,3-二醇进行一般且高效的有机催化脱对称。在无环底物中引入π系统为反应性,对映选择性和合成潜力提供了新的机会。为了达到高水平的对映选择性(高达er> 99:1),反应通过协同机制进行,该机制涉及去对称化反应和手性动力学拆分过程。该方法成功地用作唯一的对映选择性催化步骤(以克为单位开发),以实现抗骨质疏松性二芳基庚烷(-)-双皂苷A的全合成(7个步骤)。