Stereoselective synthesis of β-substituted aspartic acids via tetrahydro-1,3-oxazin-6-ones
作者:Guillaume Burtin、Pierre-Jean Corringer、Peter B. Hitchcock、Douglas W. Young
DOI:10.1016/s0040-4039(99)00705-4
日期:1999.5
Oxazinones have been synthesised and used as chiral templates in the synthesis of beta-substituted aspartic acids. Use of a Brebereck's reagant/Grignard/hydrogenation strategy gave cis-oxazinones with complete stereoselectivity, whereas an alkylation strategy, although trans-selective, gave mixtures of isomers. The oxazinones could be convened to beta-substituted aspartic acids and to regioselectively protected beta-substituted aspartic acids without loss of stereochemistry at either centre. (C) 1999 Elsevier Science Ltd. All rights reserved.
Tetrahydro-1,3-oxazin-6-ones as templates for the stereoselective synthesis of β-substituted L-aspartic acids
作者:Guillaume Burtin、Pierre-Jean Corringer、Douglas W. Young
DOI:10.1039/b004772o
日期:——
which could be reduced from the less hindered side by heterogeneous catalytic hydrogenation to give cis-oxazinones in a completely stereoselective manner. Alternatively, an alkylation strategy, although trans-selective, gave mixtures of isomers. The oxazinones were converted to β-substituted aspartic acids and to regioselectively protected β-substituted aspartic acids without loss of stereochemistry at