Redox-neutral functionalization of α-Csp<sup>3</sup>–H bonds of secondary cyclic amines: a highly atom-economical strategy for <i>N</i>-arylation/formal cross-dehydrogenative couplings
作者:Priyankar Jha、Saddam Husen、Ravindra Kumar
DOI:10.1039/d0gc04258g
日期:——
An efficient redox-neutral method has been developed for α-Csp3–H functionalization of secondary cyclic amines via concurrent N-arylation/formal cross dehydrogenation coupling (CDC) with sp2-C–H and sp3-C–H bonds of arenes and ketones, respectively. The developed protocol is operationally simple, highly atom economical and environmentally benign (E-factor = ca. 0.5). The reaction mechanism has been
Phosphazene-catalyzed desymmetrization of cyclohexadienones by dithiane addition
作者:Matthew A Horwitz、Elisabetta Massolo、Jeffrey S Johnson
DOI:10.3762/bjoc.13.75
日期:——
We report a desymmetrization of cyclohexadienones by intramolecular conjugateaddition of a tethered dithiane nucleophile. Mild reaction conditions allow the formation of diversely functionalized fused bicyclic lactones. The products participate in facially selective additionsfrom the convex surface, leading to allylic alcohol derivatives.
Site-selective 1,3-double functionalization of arenes using <i>para</i>-quinol, C–N, and C–C/C–P three-component coupling
作者:Saddam Husen、Anil Chauhan、Ravindra Kumar
DOI:10.1039/c9gc04103f
日期:——
A catalytic and site-selective approach has been demonstrated for dual functionalization of arenes via cross-coupling reactions of p-quinols with amines and isocyanides/phosphites.
Friedel–Crafts Alkylation of Indoles with <i>p</i>-Quinols: The Role of Hydrogen Bonding of Water for the Desymmetrization of the Cyclohexadienone System
作者:Carolina García-García、Laura Ortiz-Rojano、Susana Álvarez、Rosana Álvarez、María Ribagorda、M. Carmen Carreño
DOI:10.1021/acs.orglett.6b00781
日期:2016.5.6
Lewisacidcatalyzed Friedel–Crafts alkylation of indoles has been achieved in high yields and selectivities using p-quinols as electrophiles. (S)-Binol-3,3′-(9-anthracenyl)-phosphoric acid was able to catalyze the enantioselective formation of 5-(3-indole)-2-cyclohexenone derivatives. Experimental results and theoretical calculations explained the enantioselectivity based on a transition state where
total synthesis of acremoxanthone A, we report herein a model study on the construction of the EFG-ring system. The key steps include (1) intermolecular 1,3-dipolar cycloaddition of arylnitrileoxide with dienone, and (2) SNAr reaction for construction of the F ring.
朝着阿克莫吨蒽酮A的总合成的方向,我们在此报告了有关EFG环系统构建的模型研究。关键步骤包括(1)芳族腈氧化物与二烯酮的分子间1,3-偶极环加成反应,以及(2)S N Ar反应以构建F环。