Silver(I)–Ferrophox Catalyzed Enantioselective Desymmetrization of Cyclopentenedione: Synthesis of Highly Substituted Bicyclic Pyrrolidines
作者:Tapas Das、Prasenjit Saha、Vinod K. Singh
DOI:10.1021/acs.orglett.5b02582
日期:2015.10.16
A highly enantioselective desymmetrization of prochiral cyclopentene-1,3-dione via [3 + 2] cycloaddition of azomethine ylide using a silver(I)–ferrophox complex has been demonstrated. The method has been utilized in the synthesis of highly functionalized enantioenriched 5,5-fused bicyclic pyrrolidine derivatives under mild reaction conditions.
Cu(I)-Catalyzed Highly Enantioselective [3 + 3] Cycloaddition between Two Different 1,3-Dipoles, Phthalazinium Dicyanomethanides and Iminoester-Derived Azomethine Ylides
The Cu(I)-catalyzed highly enantioselective [3 + 3] cycloadditionbetween two different 1,3-dipoles, phthalazinium dicyanomethanides and iminoester-derived azomethine ylides, has been achieved under mild reaction conditions, providing novel chiral heterocyclic compounds, 2,3,4,11b-tetrahydro-1H-pyrazino[2,1-a]phthalazine derivatives, in high yields with excellent diastereo- and enantioselectivies (up
在温和的反应条件下,已实现了Cu(I)催化的两个不同的1,3-偶极,酞菁双氰胺和亚氨基酯衍生的偶氮甲碱的高对映选择性[3 + 3]环加成反应,提供了新颖的手性杂环化合物2,3 ,4,11b-四氢-1 H-吡嗪并[ 2,1- a ]酞嗪衍生物,高收率,具有出色的非对映和对映选择性(高达99%收率,99%ee,> 20:1 dr)。
Highly fluorescent 1,2-dihydropyrimido[1,6-α]indole: an efficient metal free synthesis and photophysical study
作者:Tapas Das、Anirban Kayet、Ruchika Mishra、Vinod K. Singh
DOI:10.1039/c6cc05378e
日期:——
A metal free route to highly fluorescent 1,2-dihydropyrimido[1,6-[small alpha]]indole derivatives has been developed via base catalyzed aldol followed by Mannich reaction of indole-2-carboxaldehyde with azomethine ylides at room temperature. This transformation...