Kinetic resolution of beta-hydroxyalkanephosphonates was efficiently performed by 2-fluorobenzoylation in the presence of copper(II) triflate and (R,R)-Ph-BOX as a catalyst with good s value of up to 21 (C) 2010 Elsevier Ltd. All rights reserved.
Kinetic resolution of 2-hydroxy-2-aryl-ethylphosphonates by a non-enzymatic acylation catalyst
作者:Laura Mesas-Sánchez、Alba E. Díaz-Álvarez、Petr Koukal、Peter Dinér
DOI:10.1016/j.tet.2014.03.102
日期:2014.6
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.
Kawashima Takayuki, Nakamura Mio, Nakajo Akira, Inamoto Naoki, Chem. Lett, (1994) N 8, S 1483-1486
The title reaction using dicyclohexylcarbodiimide (DCC) gave stereospecifically the corresponding olefins in good yields via tetracoordinate 1,2-oxaphosphetanes. Use of more than one equivalent of DCC afforded better yields of the olefin.