Palladium-Catalyzed Arylcarboxylation of Propargylic Alcohols with CO<sub>2</sub> and Aryl Halides: Access to Functionalized α-Alkylidene Cyclic Carbonates
trans-oxopalladation of the C≡Cbond by an ArPdX species, and a reductive elimination procedure afforded a series of functionalized α-alkylidene cyclic carbonates in moderate to excellent yields. Notably, the configuration of these tetrasubstituted olefins was dominated by the trans-oxopalladation step where the aryl group derived from ArX is located trans to the oxygen attached in the doublebond. This protocol
NIS/HFIP‐Mediated Synthesis of Indene‐Based β‐Iodoalkenyl Sulfides from Propargylic Sulfides
作者:Noelia Velasco、Clara Martínez‐Núñez、Manuel A. Fernández‐Rodríguez、Roberto Sanz、Samuel Suárez‐Pantiga
DOI:10.1002/adsc.202200613
日期:2022.9.6
A tandem 1,3-sulfur migration followed by iodocyclization reaction of propargylic sulfides in the presence of NIS in HFIP has been developed to synthesize indene-based β-iodoalkenyl sulfides. The choice of the reaction media is crucial to promote the reaction. The proposed mechanism involving the initial NIS activation by HFIP and favoring the sulfur migration of the starting propargylic thioether
earth-abundant transition metal Ni-catalyzed highly regio- and enantioselective semihydrogenation of racemic tetrasubstituted allenesvia a kinetic resolution process as a challenging task was well established. This protocol furnishes expedient access to a diversity of structurally important enantioenriched tetrasubstituted allenes and chiral allylic molecules with high regio-, enantio-, and Z/E-selectivity. Remarkably