Generation and [2,3]-Sigmatropic Rearrangement of Ammonium Ylides from Cyclopropyl Ketones for Chiral Indolizidines with Bridgehead Quaternary Stereocenters.
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DOI: 10.1021/acs.orglett.2c02759
Abstract: A sequence of nucleophilic ring opening of cyclopropyl ketones, N-quaternization, deprotonation, and [2,3]-sigmatropic rearrangement of ammonium ylides has been developed. This method enables efficient synthesis of bicyclic indolizidines bearing bridgehead aza-quaternary stereocenters from easily available… read more here.
Keywords: quaternary stereocenters; rearrangement ammonium; cyclopropyl ketones; ammonium ylides ... See more keywords
Regio- and Diastereoselective Three-Component Reactions via Trapping of Ammonium Ylides with N-Alkylquinolinium Salts: Synthesis of Multisubstituted Tetra- and Dihydroquinoline Derivatives.
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DOI: 10.1021/acs.orglett.7b01664
Abstract: Pd(II)-catalyzed three-component reactions via trapping of ammonium ylides with N-alkylquinolinium salts are reported. These reactions provided polyfunctional polycyclic tetrahydroquinolines or 4-substituted 1,4-dihydroquinolines in excellent yields (89-99% and 89-98%, respectively) with high regioselectivities and moderate to… read more here.
Keywords: component reactions; reactions via; ammonium ylides; trapping ammonium ... See more keywords