Synthesis of a New N-Diaminophosphoryl-N′-[(2S)-2-pyrrolidinylmethyl]thiourea as a Chiral Organocatalyst for the Stereoselective Michael Addition of Cyclohexanone to Nitrostyrenes and Chalcones - Application in Cascade Processes for the Synthesis of Polyc
作者:Carlos Cruz-Hernández、Eduardo Martínez-Martínez、Perla E. Hernández-González、Eusebio Juaristi
DOI:10.1002/ejoc.201801339
日期:2018.12.31
novel chiralthiourea containing a segment of privileged (2S)‐2‐pyrrolidinylmetan‐amine as well as a hydrophobic phosphoramide framework is described. The new organocatalyst exhibited good performance in asymmetricMichaeladditions, in a variety of systems including the formal [3+3] cyclization of cyclohexanone with arylidenepyruvates through a cascade process, which involves the asymmetric Michael
Highly Enantioselective Michael Addition of Nitroalkanes to Chalcones Using Chiral Squaramides as Hydrogen Bonding Organocatalysts
作者:Wen Yang、Da-Ming Du
DOI:10.1021/ol102294g
日期:2010.12.3
squaramide-based organocatalysts were facilely synthesized and applied as hydrogen bonding organocatalysts in the enantioselectiveMichaeladdition of nitroalkanes to chalcones. These organocatalysts promoted the Michaeladdition with low catalyst loading under high temperature (80 °C), affording the desired R or S enantiomers of the products flexibly in high yields with excellent enantioselectivities (93−96%
Asymmetric Michael Addition of Aromatic Ketones to Nitroolefins Catalyzed by Simple Chiral Bifunctional Primary Amine-Thioureas
作者:Liangliang Wang、Xiaoying Xu、Jun Huang、Lin Peng、Qingchun Huang、Lixin Wang
DOI:10.2174/157017810791514652
日期:2010.7.1
Simple chiral primary amine-thiourea catalysts derived from chiral 1,2-diphenylethylenediamine were found to catalyze direct Michael addition of aromatic ketones to nitroolefins with good enantioselectives (up to 86% ee) and excellent yields (up to 97%) for a broad range of substrates and successfully used in the preparation of (R)-Balcofen.