Pd(II)-Catalyzed cyclogeneration of carbocations: subsequent rearrangement and trapping under oxidative conditions
作者:Jeong Hwan Koh、Cheryl Mascarenhas、Michel R. Gagné
DOI:10.1016/j.tet.2004.06.023
日期:2004.8
A catalytic oxidative polycyclization reaction initiated by the carbocyclization of 1,5-dienes with Pd(II) is reported. Trapping of a putative carbocation with suitable functional groups (phenols, alkenes, alcohols, sulfonamide), or rearrangement protocols (Pinacol) yields poly-cyclic products in good yields and in excellent diastereoselectivities. Turnover of the intermediate Pd–C bond is via β-H
Diastereoselective Pt Catalyzed Cycloisomerization of Polyenes to Polycycles
作者:Michael J. Geier、Michel R. Gagné
DOI:10.1021/ja500656k
日期:2014.2.26
Application of a tridentate NHC containing pincer ligand to Pt catalyzed cascade cyclization reactions has allowed for the catalytic, diastereoselective cycloisomerization of biogenic alkene terminated substrates to the their polycyclic counterparts.
Enantioselective Cascade Cyclization/Protodemetalation of Polyenes with N<sub>3</sub>Pt<sup>2+</sup> Catalysts
作者:Ha Nguyen、Michel R. Gagné
DOI:10.1021/cs401190c
日期:2014.3.7
The combination of the N-based pincer ligand PyBOX with Pt2+ leads to new catalysts for the enantioselective cycloisomerization of dienyl- and trienyl-ols. The mechanistic combination of electrophilic cyclization followed by rapid protodemetalation is surprising and leads to a powerful construct for developing new reactions.
Asymmetric Oxidative Cation/Olefin Cyclization of Polyenes: Evidence for Reversible Cascade Cyclization
作者:Charles A. Mullen、Alison N. Campbell、Michel R. Gagné