Chiral phosphoric acid catalyzed enantioselective addition of thiols to in situ generated ketimines: Synthesis of N , S -ketals
作者:Rajshekhar A. Unhale、Nagaraju Molleti、Nirmal K. Rana、Sivasankaran Dhanasekaran、Subhrajyoti Bhandary、Vinod K. Singh
DOI:10.1016/j.tetlet.2016.11.114
日期:2017.1
The chiral Brønsted acid catalyzed enantioselective 1,2-addition of thiols to in situgenerated ketimines, derived from 3-hydroxyisoindolinones, has been studied. The protocol provides a variety of isoindolinone-derived N,S-ketals in up to 98% yield and up to 99% enantioselectivity. The products have been converted to a known non-nucleoside HIV-1 reverse transcriptase inhibitor and a 1,3-thiazine derivative
Unexpected Brønsted Acid-Catalyzed Domino Reaction of 3-Hydroxyisoindolin-1-ones and<i>N</i>-<i>tert</i>-Butyl Hydrazones for the Synthesis of 3-(Hydrazono)isoindolin-1-ones
3‐(Hydrazono)isoindolin‐1‐one derivatives were synthesized in excellent yields and high chemoselectivities by a Brønsted acid‐catalyzed domino reaction between 3‐hydroxyisoindolin‐1‐ones and N‐tert‐butyl hydrazones. The E‐configuration of the hydrazone products was determined by X‐ray single‐crystal diffraction.
Catalytic Enantioselective Synthesis of Difluoromethylated Tetrasubstituted Stereocenters in Isoindolones Enabled by a Multiple-Fluorine System
作者:Meng-Yu Rong、Jin-Shan Li、Yin Zhou、Fa-Guang Zhang、Jun-An Ma
DOI:10.1021/acs.orglett.0c03406
日期:2020.11.20
This unique multiple-fluorine system provides rapid access to difluoromethylated tetrasubstituted stereocenters in isoindolones with wide substrate scope under mild conditions. Further synthetic transformations to enantioenriched CF2H-isoindolones and CF2-decorated fused isoindolones were also implemented with good efficiency.
Chiral phosphoric acid-catalyzed Friedel–Crafts reaction of 2,5-disubstituted and 2-monosubstituted pyrroles with isoindolinone-derived ketimines
作者:Arben Beriša、Matija Gredičak
DOI:10.1039/d3ob00326d
日期:——
enantioselective reaction between 2,5-disubstitutedpyrroles and diaryl-ketimines, generated in situ from isoindolinone-derived alcohols, is described. Pyrrole derivatives possessing a congested tetrasubstituted stereogenic center at the β-(C3) position are generally obtained in high yields and enantioselectivities. The transformation can be extended to 2-monosubstituted pyrroles, generating chiral α-(C5)