Enantioselective 1,4-Addition Reactions of Diphenyl Phosphite to Nitroalkenes Catalyzed by an Axially Chiral Guanidine
作者:Masahiro Terada、Takashi Ikehara、Hitoshi Ube
DOI:10.1021/ja0746619
日期:2007.11.1
A highlyenantioselective 1,4-addition reaction of nitroalkenes with diphenyl phosphite was successfully accomplished using a newly developed axiallychiral guainidine catalyst. A broad range of nitroalkenes, bearing not only aromatic but also aliphatic substituents, is applicable to the present enantioselectivereaction. The method provides an efficient protocol to synthesize enantioenriched β-amino
Quinine-Catalyzed Enantioselective Michael Addition of Diphenyl Phosphite to Nitroolefins: Synthesis of Chiral Precursors of α-Substituted β-Aminophosphonates
作者:Jian Wang、Lora D. Heikkinen、Hao Li、Liansuo Zu、Wei Jiang、Hexin Xie、Wei Wang
DOI:10.1002/adsc.200600429
日期:2007.5.7
nitroalkenes has been developed. This methodology affords a facile access to enantiomerically enriched β-nitrophosphates, precursors for the preparation of synthetically and biologically useful β-aminophosphonates.
Stereodivergent Michael addition of diphenylphosphite to α-nitroalkenes in the presence of squaramide-derived tertiary amines: an enantioselective organocatalytic reaction in supercritical carbon dioxide
作者:Ilya V. Kuchurov、Albert G. Nigmatov、Evgeniya V. Kryuchkova、Alexey A. Kostenko、Alexandr S. Kucherenko、Sergei G. Zlotin
DOI:10.1039/c3gc41647j
日期:——
The first “green” asymmetric organocatalytic reaction in a supercritical carbon dioxide medium was elaborated. Under the proposed conditions (100 bar, 35 °C), α-nitroalkenes enantioselectively accept diphenylphosphite in the presence of bifunctional organocatalysts bearing the tertiary amino group and the squaramide fragment to afford corresponding β-nitrophosphonates in high yields and with enantioselectivities