catalysts with a PNP type ligand, the electron-rich chiral PNP ligands have still been rarely reported because of the difficulties in synthesis and the nature of air-sensitivity. Herein, we report a novel chiral PNP ligand (Heng-PNP) with both a rigid backbone and a bulky tert-butyl group on the phospholane motif. We successfully obtained its divalent iron complex. The chiral environment of its Ir(III) complex
reductive cyclization of easily accessible benz-tethered 1,3-dienes containing a ketone moiety. This process provided biologically active 1,2-dihydronaphthalene-1-ol derivatives in good yields with excellent enantio- and diastereoselectivity. Mechanistic investigations using density functional theory revealed that (Z)- and (E)-allylcopper intermediates formed in situ from the diene and copper catalyst
Iminium ion mediated cyclizations with 4-aryl-1,4-dihydropyridines. Bridging with thiophene and furan
作者:George D. Hartman、Wasyl Halczenko、Brian T. Phillips
DOI:10.1021/jo00352a004
日期:1986.1
HARTMAN, G. D.;HALCZENKO, W.;PHILLIPS, B. T., J. ORG. CHEM., 1986, 51, N 2, 142-148
作者:HARTMAN, G. D.、HALCZENKO, W.、PHILLIPS, B. T.
DOI:——
日期:——
Anodic Cyclizations, Seven‐Membered Rings, and the Choice of Radical Cation vs. Radical Pathways
作者:Robert J. Perkins、Ruozhu Feng、Qingquan Lu、Kevin D. Moeller
DOI:10.1002/cjoc.201900132
日期:2019.7
the rest of the sequence is futile. We report here that the key to the cyclization is channeling the reaction down the correct pathway. Some reactions require the use of a radical pathway and some require the use of a radicalcation pathway. An example of each is provided along with a strategy for accessing both pathways using a common intermediate.