Kinetic resolution of 2-hydroxy-2-aryl-ethylphosphonates by a non-enzymatic acylation catalyst
摘要:
Optically pure hydroxyphosphonates are widely used as derivatizable compounds that can be incorporated into a variety of synthetic strategies for the preparation of other high value organic products. A non-enzymatic kinetic resolution procedure to obtain chiral 2-hydroxy-2-arylethylphosphonates from the easily available racemic counterparts is described. A range of 2-hydroxy-2-arylethylphosphonates was efficiently resolved employing a planar-chiral DMAP derived catalyst with good selectivities (up to S=68). The chiral hydroxyphosphonates were isolated in good yields and high enantiomeric excess (>94% ee). (C) 2014 Elsevier Ltd. All rights reserved.
essential building blocks for organophosphorus compounds. However, the asymmetric synthesis of these units remains a significant challenge. Herein, we describe a one-pot chemoenzymatic cascade process to access chiral β-hydroxyphosphonates, which combines photo-oxidative chemical reactions and bioreductions. The incorporation of photooxidation in the chemical reaction resulted in up to 92% yield and
手性 β-羟基膦酸酯是有机磷化合物的重要组成部分。然而,这些单元的不对称合成仍然是一个重大挑战。在这里,我们描述了一种获得手性β-羟基膦酸盐的一锅化学酶级联过程,该过程结合了光氧化化学反应和生物还原。化学反应中光氧化的结合导致级联中 β-羟基膦酸酯的产率高达 92%,对映体过量 (ee) 大于 99%。此外,( S )-(2-羟基-2-苯基乙基)膦酸二乙酯的放大也证明了该策略的潜在应用。