Synthesis of Polysubstituted 2-Iodoindenes via Iodonium-Induced Cyclization of Arylallenes
作者:Charlotte Grandclaudon、Véronique Michelet、Patrick Y. Toullec
DOI:10.1021/acs.orglett.5b03634
日期:2016.2.19
2-iodoindenes. In acetonitrile or nitromethane, electrophilic sources of iodine cations react selectively with the C2–C3 double bond of 1-arylallenes to give, after anti nucleophilic attack of the aromatic ring, 2-iodoindene products in high yields. Variations of the allenic skeletons revealed the high 5-endo selectivity and some competitive pathways of cyclization. Postfunctionalization reactions of the carbon–iodine
Organocatalytic cycloaddition of carbonyl sulfide with propargylic alcohols to 1,3-oxathiolan-2-ones
作者:Hui Zhou、Rui Zhang、Hui Zhang、Sen Mu、Xiao-Bing Lu
DOI:10.1039/c9cy00062c
日期:——
adducts of a Lewis base (LB) were synthesized and first used to catalyze the cycloaddition of COS with propargylic alcohols under mild reaction conditions, selectively providing the functionalized 1,3-oxathiolane-2-ones with complete (Z) configuration selectivity. Among them, COS adducts of highly polarized olefins proved to be highly efficientorganocatalysts for this transformation, with excellent yields
Rh(III)-Catalyzed Regioselective Annulations of 3-Arylisoxazolones and 3-Aryl-1,4,2-dioxazol-5-ones with Propargyl Alcohols: Access to 4-Arylisoquinolines and 4-Arylisoquinolones
The Rh(III)-catalyzed dual directing group assisted C–H activation/annulation of 3-arylisoxazolones with propargyl alcohols has been developed, which expands the application scope of isoxazolones in organic synthesis. This protocol also worked well with 3-aryl-1,4,2-dioxazol-5-ones to produce synthetically and biologically important 4-arylisoquinolones.
Palladium-catalyzed deacetonative coupling of aryl propargylic alcohols with aryl chlorides in water
作者:Feng Chang、Yanping Liu
DOI:10.1080/00397911.2017.1297457
日期:2017.5.19
propargylic alcohols with aryl chlorides has been developed. The reaction occurs smoothly in neat water with 2 mol% PdCl2 as catalyst, and various synthetically useful functional groups, including ether, aldehyde, ketone, and heterocyclics, are well tolerated. Moreover, the reaction could proceed through a consecutive Sonogashira/deacetonative process using 2-methyl-3-butyn-2-ol and aryl chlorides as coupling
Umpolung coupling of pyridine-2-carboxaldehydes and propargylic carbonates <i>via</i> N-heterocyclic carbene/palladium synergetic catalysis
作者:Weiyang Bi、Yunhui Yang、Song Ye、Congyang Wang
DOI:10.1039/d1cc01311d
日期:——
reaction of pyridine-2-carboxaldehydes and propargylic carbonates has been developed for the first time through N-heterocycliccarbene/palladium cooperative catalysis with the judicious selection of the palladium catalyst, ligand and N-heterocycliccarbene, giving the propargylic ketones regioselectively.