Assembly of 3-Substituted Isocoumarins via a CuI-Catalyzed Domino Coupling/Addition/Deacylation Process
作者:Shangjun Cai、Fei Wang、Chanjuan Xi
DOI:10.1021/jo2026433
日期:2012.3.2
An efficient strategy for the synthesis of a variety of 3-substitutedisocoumarins has been developed. The reaction proceeded from o-halobenzoic acids and 1,3-diketones via a copper(I)-catalyzed domino reaction in DMF under the action of K3PO4 at 90–120 °C without a ligand to afford the corresponding 3-substitutedisocoumarin derivatives in good to excellent yields. o-Halobenzoic acids could be o-iodobenzoic
已经开发了用于合成多种3-取代的异香豆素的有效策略。该反应由邻卤代苯甲酸和1,3-二酮经DMF中的铜(I)催化的多米诺反应,在K 3 PO 4的作用下于90-120°C下进行,没有配体,得到相应的3-取代的异香豆素衍生物的收率为好至极好。邻卤代苯甲酸可以是邻碘苯甲酸,邻溴苯甲酸和邻氯苯甲酸衍生物。1,3-二酮可以是烷基和芳基取代的1,3-二酮。
NHC-Catalyzed Oxidative Cyclization Reactions of 2-Alkynylbenzaldehydes under Aerobic Conditions: Synthesis of O-Heterocycles
作者:Jong Hyub Park、Sachin V. Bhilare、So Won Youn
DOI:10.1021/ol200481u
日期:2011.5.6
An NHC-catalyzed, regio- and stereoselective oxidative cyclization of o-alkynylbenzaldehydes bearing an unactivated alkyne moiety as an internalelectrophile has been developed to afford phthalides and isocoumarins. A single organocatalytic system enabled two sequential C−O bond formations to take place in an atom economical manner via highly efficient dual activation. Molecular oxygen in air could
Synthesis of Isocoumarin via PTSA-Catalyzed Annulation of Diarylalkynes
作者:Olivier Provot、Mouâd Alami、Gaëlle Le Bras、Abdallah Hamze、Samir Messaoudi、Pierre-Benoît Le Calvez、Jean-Daniel Brion
DOI:10.1055/s-2008-1072575
日期:2008.5
p-Toluenesulfonic acid (PTSA) in ethanol was used as a mild acid catalyst for the annulation of various functionalized diarylalkynes under microwave irradiation. This metal-free process allowed the synthesis of a range of 3-aryl-substituted isocoumarins in good yields.
Regioselective cyclization of 2-alkynylbenzoic acid in water for the synthesis of isocoumarin
作者:Yan-Hua Wang、Guanyinsheng Qiu、Hongwei Zhou、Wenlin Xie、Jin-Biao Liu
DOI:10.1016/j.tet.2019.06.012
日期:2019.7
In this work, a regioselectivesynthesis of isocoumarins from 2-alkynylbenzoic acid is reported. The transformations proceed smoothly with good yields in water via a metal-free radical pathway. When catalytic TBAB is employed, the reaction provides various isocoumarin derivatives according to the structures of the corresponding precursors. It is believed that TBAB serves as a phase transfer catalyst