Catalytic Asymmetric Synthesis of α,β-Disubstituted α,γ-Diaminophosphonic Acid Precursors by Michael Addition of α-Substituted Nitrophosphonates to Nitroolefins
various nitroolefins are shown to proceed with high diastereo- and enantioselectivity when catalyzed by a quinine-derived thiourea-tertiary amine bifunctional catalyst and generate α,γ-diaminophosphonic acidprecursors with contiguous quaternary and tertiary stereocenters.
N-heterocyclic carbene-catalyzed method for the radical acylphosphorylation of alkenes. Electrochemical investigations were employed to identify an appropriate class of oxime phosphonates capable of undergoing a single-electron transfer (SET) with Breslow enolates. The resulting phosphoryl radicals were effectively coupled with diverse styrenes and aldehydes to yield a variety of γ-oxo-phosphonates. Both radical
Mild Preparation of 1-Benzyloxyiminoalkylphosphonic Dichlorides: Application to the Synthesis of Cyclic Phosphonic Diesters and Cyclic Monoester Amides
作者:Richard Neidlein、Holger Keller、Roland Boese
DOI:10.3987/com-92-s(t)119
日期:——
1-Benzyloxyiminophosphonates (3) were converted under very mild conditions to the corresponding phosphonyl dichlorides (5). The application toward the synthesis of diastereomeric 1,3,2-oxazaphospholidines (6/7), and diastereomeric 1,3,2-dioxaphosphorinanes (8/9) is reported. The structure of 9a was confirmed by X-ray analysis.
Bligh, S. W. Annie; Choi, Nick; McGrath, Catherine M., Journal of the Chemical Society, Dalton Transactions, 2000, # 15, p. 2587 - 2594
作者:Bligh, S. W. Annie、Choi, Nick、McGrath, Catherine M.、McPartlin, Mary、Woodroffe, Thomas M.
DOI:——
日期:——
Enantioselective Synthesis of Quaternary α-Aminophosphonates via Conjugate Addition of α-Nitrophosphonates to Enones
作者:Kalisankar Bera、Irishi N. N. Namboothiri
DOI:10.1021/ol203132h
日期:2012.2.17
Enantioselective Michael addition of alpha-nitrophosphonates to enones for the synthesis of alpha-aminophosphonates is reported for the first time. The reaction proceeds in good to high yields and moderate to high selectivity in the presence of a new quinine thiourea catalyst. The quaternary nitrophosphonates were conveniently transformed to cyclic quaternary alpha-aminophosphonates via in situ reduction intramolecular cyclization or Baeyer-Villiger oxidation followed by in situ reduction intramolecular cyclization.