Enantioselective Conjugate Addition of Alkenylboronic Acids to Indole-Appended Enones
作者:Brian J. Lundy、Santa Jansone-Popova、Jeremy A. May
DOI:10.1021/ol2020847
日期:2011.9.16
An enantioselective addition of alkenylboronic acids and alkynylboronic esters to unprotected indole-appended enones is reported. This transformation proceeds with high enantioselectivity and high product yields via the use of catalytic amounts of 3,3'-bis(pentafluorophenyl)-BINOL and Mg(Ot-Bu)(2). A range of a-branched indole derivatives are available from the transformation.
Rate Dependence on Inductive and Resonance Effects for the Organocatalyzed Enantioselective Conjugate Addition of Alkenyl and Alkynyl Boronic Acids to β-Indolyl Enones and β-Pyrrolyl Enones
作者:Amy Boylan、Thien S. Nguyen、Brian J. Lundy、Jian-Yuan Li、Ravikrishna Vallakati、Sasha Sundstrom、Jeremy A. May
DOI:10.3390/molecules26061615
日期:——
Two key factors bear on reaction rates for the conjugate addition of alkenylboronicacids to heteroaryl-appended enones: the proximity of inductively electron-withdrawing heteroatoms to the site of bond formation and the resonance contribution of available heteroatom lone pairs to stabilize the developing positive charge at the enone β-position. For the former, the closer the heteroatom is to the