.alpha.-Haloalkanesulfonyl bromides in organic synthesis. 5. Versatile reagents for the synthesis of conjugated polyenes, enones, and 1,3-oxathiole 1,1-dioxides
α- and β-Functionalized Ketones from 1,3-Dienes and Aldehydes: Control of Regio- and Enantioselectivity in Hydroacylation of 1,3-Dienes
作者:Mahesh M. Parsutkar、T. V. RajanBabu
DOI:10.1021/jacs.1c06245
日期:2021.8.18
oxidative dimerization mechanism that involves a Co(I)/Co(III) redox cycle that appears to be initiated by a cationic Co(I) intermediate. Studies of reactions using isolated neutral and cationic Co(I) complexes confirm the critical role of the cationic intermediates in these reactions. Enantioselective 1,2-hydroacylation of 2-trimethylsiloxy-1,3-diene reveals a hitherto undisclosed route to chiral siloxy-protected
New evidence for the involvement of alkylidene carbenes in the thermal isomerisation of cyclopropenes
作者:H. Hopf、A. Plagens、R. Walsh
DOI:10.1039/c39940001467
日期:——
The detection of 1-(2′-propyl)-3-methylcyclopentene amongst the products of gas-phase thermal isomerisation of 1-(1′-butyl)-3,3-dimethylcyclopropene provides unambiguous evidence for the intermediacy of an alkylidene carbene.
Convergent Synthesis of Dihydrobenzofurans via Urea Ligand-Enabled Heteroannulation of 2-Bromophenols with 1,3-Dienes
作者:Kaitlyn E. Houghtling、Amanda M. Canfield、Shauna M. Paradine
DOI:10.1021/acs.orglett.2c02301
日期:2022.8.12
diverse scope of coupling partners under a unified set of reaction conditions. Our recently developed urea ligand platform outperforms phosphine ligands to generate the dihydrobenzofuran motif in a convergent manner.
Ligand Control in Co-Catalyzed Regio- and Enantioselective Hydroboration: Homoallyl Secondary Boronates via Uncommon 4,3-Hydroboration of 1,3-Dienes
作者:Mahesh M. Parsutkar、Subhajit Bhunia、Mayukh Majumder、Remy F. Lalisse、Christopher M. Hadad、T.V. RajanBabu
DOI:10.1021/jacs.3c00181
日期:——
Enantiopure homoallylic boronate esters are versatile intermediates because the C–B bond in these compounds can be stereospecifically transformed into C–C, C–O, and C–N bonds. Regio- and enantioselective synthesis of these precursorsfrom 1,3-dienes has few precedents in the literature. We have identified reaction conditions and ligands for the synthesis of nearly enantiopure (er >97:3 to >99:1) homoallylic