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.
Visible-Light-Mediated Reactions of Electrophilic Radicals with Vinyl and Allyl Trifluoroborates
作者:Daniel Fernandez Reina、Alessandro Ruffoni、Yasair S. S. Al-Faiyz、James J. Douglas、Nadeem S. Sheikh、Daniele Leonori
DOI:10.1021/acscatal.7b01120
日期:2017.6.2
Visible-light photoredox catalysis enables the vinylation and allylation of electrophilic radicals with readily available potassium trifluoroborate reagents. The processes show good functional group compatibility, and mechanistic and computational studies have elucidated some of the aspects associated with the key radical addition step.
the presence of a well-established photoremovable phenacyl group in the avobenzone structure. Steady-state photolysis of the dyad in hydrogen-donor solvents, monitored by UV-Vis spectrophotometry and HPLC, confirms the simultaneous photorelease of diclofenac and avobenzone. Laser flashphotolysis and phosphorescence emission experiments allow us to gain insight into the photoactive triplet excited-state