formal Betti reaction between variously substituted phenols and benzophenone-derived imines to afford α-triphenylmethylamines is reported. The key to the success of this transformation is the in situ generation of the reactive benzophenone iminium species under organocatalytic conditions. Different phenols reacted smoothly, enabling the synthesis of an array of α-triphenylmethylamines, which are highly
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
Asymmetricaddition of indoles to cyclic α-diaryl-substituted N-acyl imines, which are generated in situ from 3-aryl 3-hydroxyisoindolinones, is described. The transformation proceeds smoothly with a broad range of indoles and isoindolinone alcohols using a SPINOL-derived chiral Brønsted acid catalyst to afford α-tetrasubstituted (3-indolyl)(diaryl)methanamines in excellent yields and enantioselectivities
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.