An efficient and versatile tandem process of acetalization and cycloisomerization reactions has been developed for the reactions of 1-alkynyl-2-carbonylquinoline substrates. The reaction occurs thanks to Au(I) and Ag(I) catalysis. Silver(I) catalysis has been extensively studied (11 different silver species) on a broad range of quinoline derivatives (variation of alkyne substituent, of carbonyl function
Phosphoramidates as Transient Precursors of Nitrogen‐Centered Radical Under Visible‐Light Irradiation: Application to the Synthesis of Phthalazine Derivatives
作者:Maxime De Abreu、Mohamed Selkti、Philippe Belmont、Etienne Brachet
DOI:10.1002/adsc.202000018
日期:2020.5.26
N‐Centered Radical (NCR) precursors under visible‐light irradiation. More precisely among this class of phosphorus‐derived compounds, we studied the radical reactivity of phosphonohydrazones, under mild reaction conditions, which allowed the synthesis of a wide and diversified library of the scarcely reported phthalazine scaffold. Mechanistic investigations confirmed the formation of a NCR from these brand‐new
Novel Platinum-Catalyzed Tandem Reaction: An Efficient Approach to Construct Naphtho[1,2-<i>b</i>]furan
作者:Hao Wei、Hongbin Zhai、Peng-Fei Xu
DOI:10.1021/jo802645s
日期:2009.3.6
An efficient approach to synthesize naphtho[1,2-b]furan has been developed via platinum-catalyzedtandem reaction. This new tandem catalysis induces a cycloisomerization of allenyl ketone, followed by a 6π-electrocyclization-type reaction of carbene intermediate. The metal carbene proved to be an effective intermediate in the 6π-electrocyclization-type reaction.
通过铂催化串联反应,已经开发了一种合成萘并[1,2- b ]呋喃的有效方法。这种新的串联催化作用引起烯丙基酮的环异构化,然后进行卡宾中间体的6π-电环化型反应。金属卡宾被证明是6π-电环化型反应的有效中间体。
Synthesis of Cyclic Alkenyl Ethers via Intramolecular Cyclization of <i>O</i>-Alkynylbenzaldehydes. Importance of Combination between CuI Catalyst and DMF
作者:Nitin T. Patil、Yoshinori Yamamoto
DOI:10.1021/jo049416b
日期:2004.7.1
remarkably general method for the synthesis of cyclic alkenyl ethersvia the Cu(I)-catalyzed intramolecular cyclization of O-alkynylbenzaldehydes has been developed. The survey of metal catalysts and solvents revealed that the combination of copper(I) iodide and DMF was the catalytic system of choice. The reaction most probably proceeds via the nucleophilic addition of alcohols 2 to O-alkynylbenzaldehydes
Hydrazones 12a,b,f furnish annulated indenone derivatives (6-azafulvenes) 13a-d upon deprotonation with t-BuOK in DMF at 50 °C. In contrast, deprotonation of a similar N-methyl hydrazone 12d unexpectedly leads to the isoquinoline derivative 15. Mechanisms for both transformations are proposed, supported by quantum chemical density functional theory (DFT) and ab initio calculations.