Palladium Nanoparticles‐Catalyzed Synthesis of Indanone Derivatives via Intramolecular Reductive Heck Reaction
作者:Naziya Parveen、Govindasamy Sekar
DOI:10.1002/adsc.201900752
日期:2019.10.8
An efficient protocol for the straightforward, single‐step synthesis of 3‐aryl‐1‐indanones from 2′‐iodochalcone via reductive Heckreaction using phosphine free, stable and reusable binaphthyl stabilized palladium nanoparticle (Pd‐BNP) as a catalyst has been described. An immense array of substrate scope with electron‐rich and deficient 2′‐iodochalcones have been synthesized. Further derivatization
process for the formation of diethyl 2-aryl-3,4-dihydro-4-oxo-1,1(2H)-naphthalenedicarboxylate is described by using a combination of Michael addition and copper-catalyzed α-arylation of malonicacidderivatives. The protocol worked well for a variety of 1-(2-iodoaryl)enones and displayed great functional group compatibility. Michael addition - copper - catalysis - cascade reactions- α-arylation
Domino Synthesis of Thioflavones and Thioflavothiones by Regioselective Ring Opening of Donor–Acceptor Cyclopropane Using In-Situ-Generated Thiolate Anions
作者:Nallappan Sundaravelu、Govindasamy Sekar
DOI:10.1021/acs.orglett.9b02210
日期:2019.9.6
A copper-catalyzed intramolecular ring opening of donor-acceptor cyclopropane is developed for the synthesis of 3-alkyl-carbonated thioflavones and further extended to 3-alkyl-carbonated thioflavothione, using xanthate as a sulfur surrogate. This reaction proceeds through thiolate formation/ring opening/Krapcho decarboxylation, followed by hydrogen abstraction, to give thioflavanone, which is further