Enantioselective 1,2-Addition of α-Aminoalkyl Radical to Aldehydes via Visible-Light Photoredox Initiated Chiral Oxazaborolidinium Ion Catalysis
作者:Jae Yeon Kim、Yea Suel Lee、Yuna Choi、Do Hyun Ryu
DOI:10.1021/acscatal.0c02443
日期:2020.9.18
Enantioselective 1,2-addition reaction of α-aminoalkyl radical to α,β-unsaturated or aromaticaldehydes to synthesize highly optically active β-amino alcohols has been developed. In the presence of chiral oxazaborolidinium ion catalyst and photosensitizer, the reaction provides desired β-amino allylic or benzylic alcohols with high yields (up to 99%) and high enantioselectivities (up to 98% ee).
The reaction of aldehyde enol silyl ethers with lead(IV) acetate
作者:George M. Rubottom、Roberto Marrero、John M. Gruber
DOI:10.1016/s0040-4020(01)88584-7
日期:1983.1
The treatment of aldehydeenol silyl ethers 1 with lead(IV) acetate (LTA) using methylene chloride as solvent gives rise to the production of ⇌-acetoxy aldehydes 2 and glycolic ester derivatives 3 or enals 5. Structural variations in 1 are used to explain the divergent trends. When 1 is treated with LTA/KOAc/AcOH, high yields of the corresponding ⇌-acetoxy aldehydes 2 are obtained with the formation