Synthesis and application of L-proline and R-phenylglycine derived organocatalysts for direct asymmetric Michael addition of cyclohexanone to nitroalkenes
Effective asymmetric Michael addition of anthrone to nitroalkenes using chiral tetraoxacalix[2]arene[2]triazines as organocatalysts
作者:Hayriye Nevin Genc
DOI:10.1002/chir.23108
日期:2019.9
Novel chiral secondary amines bearing a tetraoxacalix[2]arene[2]triazine scaffold were created and used for catalytic asymmetricMichael reaction of anthrone with nitroalkenes. The relevant adducts were obtained in good to excellent yields (82%‐98%) and enantioselectivities (75%‐98%).
Design, Synthesis, and Application of Chiral Nonracemic Lithium Amide Bases in Enantioselective Deprotonation of Epoxides
作者:Debnath Bhuniya、Arpita DattaGupta、Vinod K. Singh
DOI:10.1021/jo960244v
日期:1996.1.1
The reaction of epoxides with chiral nonracemic lithiumamidebases, designed and prepared from (R)-phenylglycine, has been studied in detail. A maximum of 80% ee was obtained for conversion of cyclohexene oxide to (S)-2-cyclohexen-1-ol. Enantioselective deprotonation of a variety of other epoxides was studied. A cyclopentanoid core unit for prostaglandin synthesis was synthesized in 97% ee.