A new palladium-catalyzed cyclization of N-alkenyl-o-haloanilines with selective isomerization of a double bond followed by formal 5-endo-trig cyclization was developed. A variety of fused and 2-substitutedindoles were synthesized from enaminoesters prepared by condensation of β-ketoesters and o-iodoaniline.
Domino routes to substituted benzoindolizines: tandem reorganization of 1,3-dipolar cycloadducts of nitrones with allenic esters/ketones and alternative cycloaddition–palladium catalyzed cyclization pathway
作者:Ashish Kapur、Kamal Kumar、Lakhwinder Singh、Parminder Singh、Munusamy Elango、Venkatesan Subramanian、Vivek Gupta、Priyanka Kanwal、Mohan Paul S. Ishar
DOI:10.1016/j.tet.2009.03.076
日期:2009.6
intramolecular aza Diels–Alderreaction in the intermediate C. DFT calculations of various parameters for diene and dienophile components in the proposed intermediate C have revealed that conformational constraints imposed by the alkyl groups (R=Me, Et) favor intramolecular aza-Diels–Alder cycloaddition. An alternative domino route to benzoindolizines (9a,d,g) involving sequential one-pot cycloaddition of azadienes
Ligand functionalization as a deactivation pathway in a fac-Ir(ppy)<sub>3</sub>-mediated radical addition
作者:James J. Devery III、James J. Douglas、John D. Nguyen、Kevin P. Cole、Robert A. Flowers II、Corey R. J. Stephenson
DOI:10.1039/c4sc03064h
日期:——
Kinetic, synthetic, and spectroscopic evidence demonstrates the instability of fac-Ir(ppy)3 under visible light-mediated photoredox conditions resulting from in situ functionalization.
we reported the heterogeneousphotocatalyticC–H alkylation of indoles with diazo compounds using graphitic carbonnitride (g-C3N4) as the photocatalyst. The reaction was carried out under a simple operation and mild conditions. In addition, the catalyst was found to be stable and reusable after five reaction cycles. The photochemical reaction proceeds via an intermediary of a carbon radical, which
在此,我们报道了使用石墨氮化碳(gC 3 N 4)作为光催化剂,吲哚与重氮化合物的非均相光催化C-H烷基化反应。该反应操作简单,条件温和。此外,发现该催化剂在五个反应循环后稳定且可重复使用。光化学反应通过碳自由基的中介进行,碳自由基是通过可见光促进的质子耦合电子转移(PCET)过程从重氮化合物产生的。