The various α-aminophosphonates have been prepared from tertiary aromatic and aliphatic amines with P(O)H compounds via a tert-butyl hydroperoxide mediated cross-dehydrogenativecouplingreaction, eliminating the need for transition-metal catalysts. The oxidation of tertiary amine by tert-butyl hydroperoxide generates an iminium cation intermediate. A further addition of P(O)H compound to iminium cation
Photoredox catalyzed C–P bond forming reactions—visible light mediated oxidative phosphonylations of amines
作者:Magnus Rueping、Shaoqun Zhu、René M. Koenigs
DOI:10.1039/c1cc12907d
日期:——
A visible light mediated, carbonâphosphorus bond forming reaction has been developed. With the use of a readily available photoredox catalyst, α-amino phosphonates were obtained in good yields under mild reaction conditions.
Light-Mediated Heterogeneous Cross Dehydrogenative Coupling Reactions: Metal Oxides as Efficient, Recyclable, Photoredox Catalysts in CC Bond-Forming Reactions
作者:Magnus Rueping、Jochen Zoller、David C. Fabry、Konstantin Poscharny、René M. Koenigs、Thomas E. Weirich、Joachim Mayer
DOI:10.1002/chem.201103242
日期:2012.3.19
Let there be light: A heterogeneous photocatalytic system based on easily recyclable TiO2 or ZnO allows cross dehydrogenative coupling reactions of tertiary amines. The newly developed protocols have successfully been applied to various CC and CP bond‐formingreactions to provide nitro amines as well as amino ketones, nitriles and phosphonates.
Halogen Bond (XB) Promoted α-Tribromomethylation of <i>N</i>-Aryltetrahydroisoquinolines and Further Cyclization to 5,6-Dihydroindolo[2,1-<i>a</i>]isoquinolines
Using CBr4 as a halogen bond donor and the source of tribromomethyl group, a halogen bond promoted tribromomethylation of N-aryltetrahydroisoquinolines was achieved. This reaction was also extended to the construction of the dibenzopyrrocoline alkaloid skeleton through a one-pot process. The mechanistic study confirmed the existence of the halogen bond.