Synthesis of chiral sulfonylmethyl isocyanides, and comparison of their propensities in asymmetric induction reactions with acetophenones1
作者:Frans J.A. Hundscheid、Vishnu K. Tandon、Pieten H.F.M. Rouwette、Albert M. van Leusen
DOI:10.1016/s0040-4020(01)87684-5
日期:1987.1
Seven chiral analogues of tosylmethyl isocyanide (TosMIC) were synthesized in order to investigate and compare their ability to achieve asymmetricinduction in base mediated reactions with acetophenone and trifluoroacetophenone. Acid hydrolysis of the intermediate 2-oxazolines (10 and 11) gave optically active α-hydroxy aldehydes (12 and 13).
Copper‐Catalyzed Olefination of 4‐CF
<sub>3</sub>
‐Substituted Cyclohexadienones Using Sulfonylmethyl Isocyanides: An Electrostatic Repulsion‐Controlled Regioselectivity Switch Strategy
作者:Seungwon Lee、Mohamed Ahmed Abozeid、Hun Young Kim、Kyungsoo Oh
DOI:10.1002/adsc.202201333
日期:2023.2.21
was shown to exert a pronounced electrostatic repulsion effect to give the olefination products via a preferential [3+2] cycloaddition with the ketone moiety followed by a facile fragmentation of transient oxazoline intermediates. The current Cu(II)-catalyzed olefination of 4-CF3-substituted cyclohexadienones demonstrates the reaction dichotomy involving a CF3-controlled 1,2-addition over a Van Leusen