Organocatalytic Access to Enantioenriched Dihydropyran Phosphonates via an Inverse-Electron-Demand Hetero-Diels–Alder Reaction
作者:Christian F. Weise、Vibeke H. Lauridsen、Raoní S. Rambo、Eva H. Iversen、Marie-Luise Olsen、Karl Anker Jørgensen
DOI:10.1021/jo500347a
日期:2014.4.18
hetero-Diels–Alder reaction of the remote olefin functionality in dienamines has been developed by the simultaneous activation of α,β-unsaturated aldehydes and acyl phosphonates. The dual activation is based on an organocatalyst that activates both the α,β-unsaturated aldehyde, through dienamine formation, and the acyl phosphonate by hydrogen-bonding. The enantioselective reaction results in the formation
DABCO-catalyzed regioselective cyclization reactions of β,γ-unsaturated α-ketophosphonates or β,γ-unsaturated α-ketoesters with allenic esters
作者:Cheng-Kui Pei、Lei Wu、Zhong Lian、Min Shi
DOI:10.1039/c1ob06507f
日期:——
Highly efficient DABCO-catalyzed [4 + 2] cycloaddition of β,γ-unsaturatedα-ketophosphonates or β,γ-unsaturated α-ketoesters with allenicesters gives the corresponding highlyfunctionalized tetrahydropyran and dihydropyran derivatives in good to excellent yields and moderate to good regioselectivities under mild conditions.