Rationally Designed Chiral Synthons Enabling Asymmetric <i>Z</i>- and <i>E</i>-Selective Vinylogous Aldol Reactions of Aldehydes
作者:Akhil Padarti、Hyunsoo Han
DOI:10.1021/acs.orglett.8b00230
日期:2018.3.2
In a conceptually different approach, highly stereoselective 2-oxonia-Cope rearrangement reactions between rationally designed nonracemic vinylogous aldolation synthons and aldehydes are described to provide δ-hydroxy-α,β-unsaturated esters with excellent enantioselectivities and, for the first time, unprecedented Z- and E-selectivities without the regioselectivity issue.
An improved stereoselective total synthesis of (R)-rugulactone
作者:Abhishek Goswami、Partha Pratim Saikia、Bishwajit Saikia、Devdutt Chaturvedi、Nabin C. Barua
DOI:10.1016/j.tetlet.2011.07.109
日期:2011.10
A novel route for the stereoselectivetotalsynthesis of (R)-rugulactone 1 has been developed, starting from substituted epoxide 4 and 3-phenylpropionaldehyde 5 employing Julia-Kocienski olefination as a key step to construct E-configured α,β-unsaturated keto-group. The overall yield of the synthesized rugulactone is 19.94% and is better than the reported methods.