Journal
ORGANIC LETTERS
Volume 25, Issue 44, Pages 8027-8032Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.3c03252
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This study describes an organocatalytic asymmetric [3 + 2] cyclo-addition of beta-trifluoromethyl enones with 3-(N-2,2,2-trifluoroethyl) benzothiophene ketimines and 2-(N-2,2,2-trifluoroethyl) benzothiophene ketimines for the first time. A wide range of vicinally bis(trifluoromethyl)-substituted spiro pyrrolidine-benzothiophenones were obtained with excellent stereocontrol, including those with four contiguous stereocenters in the spirocyclic benzothiophenone moiety.
An organocatalytic asymmetric [3 + 2] cyclo-addition of beta-trifluoromethyl enones with 3-(N-2,2,2-trifluoroeth-yl) benzothiophene ketimines and 2-(N-2,2,2-trifluoroethyl) benzothiophene ketimines was described for the first time. A wide spectrum of vicinally bis(trifluoromethyl)-substituted spiro pyrrolidine-benzothiophenones were obtained with excellent stereocontrol (all cases >20:1 dr and up to 99% ee). The highlight of this work is the extremely high efficiency in the construction of spirocyclic benzothiophenone derivatives possessing a vicinally bis(trifluoromethyl)-substituted pyrrolidine moiety with four contiguous stereocenters.
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