Halogenative Deoxygenation of Ketones; Vinyl Bromides and/orgem-Dibromides by Cleavage of 1,3-Benzodioxoles (Ketone Phenylene Acetals) with Boron Tribromide
Halogenative Deoxygenation of Ketones; Vinyl Bromides and/orgem-Dibromides by Cleavage of 1,3-Benzodioxoles (Ketone Phenylene Acetals) with Boron Tribromide
Some reactions of 1,3-benzoxathioles and 1,3-benzodioxoles with Grignardreagents were examined in order to verify whether or not reduction products were present in addition to the substitution and elimination products previously observed. The reaction mixtures contain reduction products whenever the Grignardreagent has β-hydrogen atoms, in which case the reagent is likely to act as a hydride transfer
Ru<sub>3</sub>(CO)<sub>12</sub>-Catalyzed Reactions of Catechols with Alkynes: An Atom-Economic Process for the Synthesis of 2,2-Disubstituted 1,3-Benzodioxoles from the Double Addition of the O−H Bond Across a Triple Bond
作者:Ming Li、Ruimao Hua
DOI:10.1021/jo801633w
日期:2008.11.7
Ru3(CO)12 has been found to be the efficient catalyst for the addition reactions of catechols with both terminal and internal alkynes to selectively afford 2,2-disubstituted 1,3-benzodioxoles in good to high yields. The formation of 2,2-substituted 1,3-benzodioxoles results from the tandem addition of two O-H bonds of catechols to alkyne's triple bond.