Regiodivergent Access to Five- and Six-Membered Benzo-Fused Lactams: Ru-Catalyzed Olefin Hydrocarbamoylation
作者:Bin Li、Yoonsu Park、Sukbok Chang
DOI:10.1021/ja411913e
日期:2014.1.22
We report herein a new strategy of the Ru-catalyzed intramolecular olefin hydrocarbamoylation for the regiodivergent synthesis of five- and six-membered benzo-fused lactams starting from N-(2-alkenylphenyl)formamides. Using a combined catalyst of Ru3(CO)12/Bu4NI in DMSO/toluene cosolvent (catalytic system A), a 5-exo-type cyclization proceeds favorably to form indolin-2-ones as a major product in good
The tandem reaction combining radical and ionic processes: an efficient approach to substituted 3,4-dihydroquinolin-2-ones
作者:Wang Zhou、Liangren Zhang、Ning Jiao
DOI:10.1016/j.tet.2009.01.027
日期:2009.3
pharmaceuticals. However, the direct intramolecular radicalcyclizations of the corresponding amide compounds favor 5-exo products 2. Reports on the radicalcyclization reactions producing 3,4-dihydroquinolin-2-one derivatives are limited. Herein, an efficient tandem reaction combining radical and ionic processes was developed, which provides a practical syntheticstrategy for the synthesis of substituted
<i>Endo</i>/<i>Exo</i>-Controllable Photocyclization by EnT-SET-Switch
作者:Xian-Peng Cai、Bin-Hong Han、Fu-Tong Cen、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.3c00837
日期:2023.4.28
CBZ6, a redox-neutral non-donor–acceptor-type organo-photocatalyst, presents a strong reductive potential with an oxidative potential of −2.16 V (vs SCE). It can work as a photosensitizer for both single-electron transfer and triplet energy transfer processes. This feature enables site-selective control in the intramolecular hydroarylation of acrylamides. Both 5-exo-trig and 6-endo-trig cyclization
Enantioselective Annulations for Dihydroquinolones by in Situ Generation of Azolium Enolates
作者:Anna Lee、Ashkaan Younai、Christopher K. Price、Javier Izquierdo、Rama K. Mishra、Karl A. Scheidt
DOI:10.1021/ja505880r
日期:2014.7.30
A convergent, catalytic asymmetric formal [4 + 2] annulation for the synthesis of dihydroquinolones has been developed. Carboxylic acids can be employed as precursors to NHC enolates through an in situ activation strategy. Simultaneous generation of a reactive aza-o-quinone methide under the basic conditions employed for NHC generation leads to a dual activation approach.
Ionic diamine rhodium complex catalyzed hydroaminomethylation of 2-allylanilines
作者:Kazumi Okuro、Howard Alper
DOI:10.1016/j.tetlet.2010.07.048
日期:2010.9
Ionic diamine rhodium complexes catalyze the hydroaminomethylation of 2-allylanilines. The reaction involves initial hydroformylation followed by reductive amination, which provides direct access to 1,2,3,4-tetrahydroquinolines and 2,3,4,5-1H-1-benzazepines. (C) 2010 Elsevier Ltd. All rights reserved.