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。
Modular synthesis of 3-substituted isocoumarins <i>via</i> silver-catalyzed aerobic oxidation/<i>6-endo</i> heterocyclization of <i>ortho</i>-alkynylbenzaldehydes
作者:Hao Wu、Yi-Chun Wang、Andrey Shatskiy、Qiu-Yan Li、Jian-Quan Liu、Markus D. Kärkäs、Xiang-Shan Wang
DOI:10.1039/d1ob01065d
日期:——
A method involving silver-catalyzed aerobic oxidation/6-endo heterocyclization of ortho-alkynylbenzaldehydes to yield 3-substituted isocoumarins is described. The developed protocol allows convenient access to a range of synthetically useful 3-substituted isocoumarins and related fused heterocyclolactones in good to high yields, using silver tetrafluoroborate as the catalyst, and atmospheric oxygen
Triflic acid mediated sequential cyclization of ortho-alkynylarylesters with ammonium acetate
作者:Maciej E. Domaradzki、Xiaochen Liu、Jiye Ong、Gyeongah Yu、Gan Zhang、Ariel Simantov、Eliyahu Perl、Yu Chen
DOI:10.1016/j.tet.2020.131437
日期:2020.9
A triflicacid (TfOH) mediated sequential cyclization of ortho-alkynylarylesters and ammonium acetate (NH4OAc) was reported. The reaction took place via a Brønsted acid-mediated intramolecular cyclization of ortho-alkynylarylesters followed by an ammonium acetate participated substitution reaction, forming isoquinolin-1-ones as the major products. Different from most of the known synthetic methods
highly efficient strategy for the synthesis of 3-substituted isocoumarins through a copper(I)-catalyzed reaction of 1-(2-halophenyl)-1,3-diones has been developed. The procedure is based on a cascade copper-catalyzed intramolecular Ullmann-type C-arylation and rearrangement process. This methodology is tolerant of a wide range of substrates and applicable to librarysynthesis.