Total synthesis of artochamins F, H, I, and J through cascade reactions
作者:K.C. Nicolaou、Troy Lister、Ross M. Denton、Christine F. Gelin
DOI:10.1016/j.tet.2008.02.108
日期:2008.5
A concise and efficient cascade-based total synthesis of artochamins F, H, I, and J is described. The potential biogenetic connection between artochamin F, or a derivative thereof, and artochamins H, I, and J, through an unusual formal [2+2] cycloaddition process, was shown to be feasible. An alternative mechanism for this transformation is also proposed.
Phenylsulfonyl Ene−Allenes as Efficient Precursors to Bicyclic Systems via Intramolecular [2 + 2]-Cycloaddition Reactions
作者:Albert Padwa、Helmut Lipka、Scott H. Watterson、S. Shaun Murphree
DOI:10.1021/jo0345796
日期:2003.8.1
stereospecificity involves initial diradical formation, followed by a rapid ring closure to the more stable cis-fused ring system. The tether may be equipped with heteroatoms, allowing for the formation of fused heterocycles (e.g., 61), and the cycloaddition can be facilitated by the introduction of sterically bulky groups and/or by conformational rigidity to the tether. Other modes of cyclization were observed
A Photocatalytic Regioselective Direct Hydroaminoalkylation of Aryl-Substituted Alkenes with Amines
作者:Natalia A. Larionova、Jun Miyatake Ondozabal、Emily G. Smith、Xacobe C. Cambeiro
DOI:10.1021/acs.orglett.1c01715
日期:2021.7.16
hydroaminoalkylation of cinnamate esters has been developed. The reaction involves the regioselective addition of α-aminoalkyl radicals generated from aniline derivatives or aliphatic amines to the α-position of unsaturated esters. The scope of aromatic alkenes was extended to styrenes undergoing hydroaminoalkylation with anti-Markovnikov selectivity, which confirms the importance of the aromatic group
PHOTOCHEMICAL METHODS OF MAKING CYCLOBUTANE BORONATES AND RELATED COMPOUNDS
申请人:Wisconsin Alumni Research Foundation
公开号:US20190040085A1
公开(公告)日:2019-02-07
The present technology relates generally cyclobutane boronates, including methods of preparation by exposing a mixture of a compound of Formula I in a solvent
and a catalytic amount of a visible light sensitizer to provide a compound of Formula II, stereoisomers thereof, and/or salts of any of the foregoing.
The cyclobutane boronate compounds are useful intermediates in the preparation of pharmaceutically active compounds as well as other other useful compounds.
Carbonyl–Olefin Metathesis Catalyzed by Molecular Iodine
作者:Uyen P. N. Tran、Giulia Oss、Martin Breugst、Eric Detmar、Domenic P. Pace、Kevin Liyanto、Thanh V. Nguyen
DOI:10.1021/acscatal.8b03769
日期:2019.2.1
The carbonyl–olefin metathesisreaction could facilitate rapid functional group interconversion and allow construction of complicated organic structures. Herein, we demonstrate that elemental iodine, a very simple catalyst, can efficiently promote this chemical transformation under mild reaction conditions. Our mechanistic studies revealed intriguing aspects of the activation mode via molecular iodine