Construction of Sulfonyl Phthalides via Copper-Catalyzed Oxysulfonylation of 2-Vinylbenzoic Acids with Sodium Sulfinates
作者:Yan-Shi Xiong、Bin Zhang、Yang Yu、Jiang Weng、Gui Lu
DOI:10.1021/acs.joc.9b01646
日期:2019.11.1
Copper-catalyzed difunctionalization of 2-vinylbenzoic acids with sodiumsulfinates to construct substituted lactones has been realized. This protocol employs inexpensive CuCl2 as the catalyst, di-tert-butyl peroxide or O2 as the terminal oxidant, and readily available sodiumsulfinates as sulfonylation reagents. High functional group tolerance and excellent yields were demonstrated by the efficient
Carboxy-directed asymmetric hydrogenation of α-alkyl-α-aryl terminal olefins: highly enantioselective and chemoselective access to a chiral benzylmethyl center
A carboxy-directedasymmetrichydrogenation of α-alkyl-α-aryl terminal olefins was developed by using a chiral spiro iridium catalyst, providing a highly efficient approach to the compounds with a chiral benzylmethyl center. The carboxy-directedhydrogenation prohibited the isomerization of the terminal olefins, and realized the chemoselective hydrogenation of various dienes. The concise enantioselective
A palladium-catalyzedintramolecular isoindolinone-forming aminooxygenation of alkenes with 1 atm of oxygen as oxidant is reported. A variety of functionalized alkenes and carboxylic acids can be used, and high yields were observed. Preliminary mechanistic studies revealed that the aminooxygenation products were formed through the oxidation of a C–PdII species using a strong oxidant, peroxide, which
报道了钯催化分子内异吲哚满酮形成的氨基氧合反应,其中氧原子为1个大气压。可以使用多种官能化的烯烃和羧酸,并且观察到高收率。初步的机理研究表明,氨基氧化产物是通过使用强氧化剂过氧化物将C-Pd II物种氧化而形成的,该过氧化物是由Pd(OAc)2 / bpy / O 2 / HOAc催化系统原位产生的。
Pd<sup>II</sup>
-Catalyzed Oxidative Tandem aza-Wacker/Heck Cyclization for the Construction of Fused 5,6-Bicyclic N,O-Heterocycles
A PdII‐catalyzedoxidative tandem cyclization was developed for the construction of fused 5,6‐bicyclic N, O‐heterocycles. This reaction was enabled by the combined use of a 3‐methylpyridine ligand and pentafluorobenzoic acid additive. A range of heterocyclic products with different substituents could be prepared in moderate to good yields via this methodology. Several transformations, including a scaled‐up
An efficient N-centered radical intramolecular cyclizationreaction of alkenyl amides induced by visible light was described. In this process, an alkenyl amide underwent 5-exo/6-endo cyclization to selectively yield two critical alkaloid structures, namely isoindolinones and isoquinolinones.