Thioglycoluril as a Novel Organocatalyst:
Rapid and Efficient α-Monobromination of 1,3-Dicarbonyl
Compounds
作者:Anxin Wu、Liping Cao、Jiaoyang Ding、Guodong Yin、Meng Gao、Yitao Li
DOI:10.1055/s-0029-1216746
日期:——
Thioglycoluril as a novel hydrogen-bonding organocata- lyst, combined with NBS, in MeOH provided rapid and efficient α-monobromination of 1,3-dicarbonylcompounds in excellent yields at room temperature. A bifunctional catalytic mechanism was proposed from these results.
Molybdenum(VI) Dichloride Dioxide Catalyzed Conversion of β-Hydroxycarbonyls into α-Bromo 1,3-Dicarbonyls by N-Bromosuccinimide
作者:Dillip Chand、Kandasamy Jeyakumar
DOI:10.1055/s-0028-1083273
日期:2009.1
1,3-dicarbonyl compounds is achieved with MoO2Cl2 in the presence of N-bromosuccinimide. All the reactions were carried out under mild conditions and provide good yields of the products. No bromination occurs at benzylic and allylic positions. β-hydroxycarbonyl compounds - oxidation - bromination - molybdenum - N-bromosuccinimide