Application of asymmetric phase-transfer catalysis in the enantioselective synthesis of cis-5-substituted proline esters
摘要:
A simple, highly stereoselective three-step sequence for the enantioselective synthesis of cis-5-substituted praline esters is described. This sequence features an asymmetric PTC Michael addition, followed by acid catalysed imine exchange and catalytic hydrogenation. Application of this chemistry in the synthesis of the nonpeptide cholecystokinin antagonist (+)-RP-66803 11 is also described. (C) 2010 Elsevier Ltd. All rights reserved.
Application of asymmetric phase-transfer catalysis in the enantioselective synthesis of cis-5-substituted proline esters
摘要:
A simple, highly stereoselective three-step sequence for the enantioselective synthesis of cis-5-substituted praline esters is described. This sequence features an asymmetric PTC Michael addition, followed by acid catalysed imine exchange and catalytic hydrogenation. Application of this chemistry in the synthesis of the nonpeptide cholecystokinin antagonist (+)-RP-66803 11 is also described. (C) 2010 Elsevier Ltd. All rights reserved.
Asymmetric Conjugate Addition of Glycine Derivatives under Copper Catalysis
作者:Mark Strohmeier、Kevin Leach、Matthew A. Zajac
DOI:10.1002/anie.201105258
日期:2011.12.16
Coppertunity knocks: An inexpensive, practical, and environmentally benign procedure for the enantioselective addition of glycinederivatives to α,β‐unsaturated ketones has been developed (see scheme). By modifying the workup, the conjugateaddition product or a cyclic imine can be accessed. The solution structure of the catalyst–substrate complex is shown to be key to the overall reaction selectivity
Application of asymmetric phase-transfer catalysis in the enantioselective synthesis of cis-5-substituted proline esters
作者:Barry Lygo、Christopher Beynon、Michael C. McLeod、Claude-Eric Roy、Charles E. Wade
DOI:10.1016/j.tet.2010.09.075
日期:2010.11
A simple, highly stereoselective three-step sequence for the enantioselective synthesis of cis-5-substituted praline esters is described. This sequence features an asymmetric PTC Michael addition, followed by acid catalysed imine exchange and catalytic hydrogenation. Application of this chemistry in the synthesis of the nonpeptide cholecystokinin antagonist (+)-RP-66803 11 is also described. (C) 2010 Elsevier Ltd. All rights reserved.