Diversity-Oriented Synthesis of Enantiopure Furofurans from Carbohydrates: An Expedient Approach with Built-in Michael Acceptor, Masked Aldehyde and Leaving Group in a Single Sugar Derivative
作者:Chinmoy Manna、Tanmaya Pathak
DOI:10.1002/ejoc.201300603
日期:2013.9
A single sugar molecule containing three functional groups, namely a masked aldehyde, a Michael acceptor and a leaving group, reacts with a series of β-dicarbonyl compounds and related reagents to form up to three new bonds and up to three new stereocenters. The configuration of the sugarderivative controls the diastereoselectivity in the formation of all the new bonds without a requirement for any
Diastereoselective Michael Initiated Ring Closure on Vinyl Sulfone-Modified Carbohydrates: A Stereospecific and General Route to α-Substituted Cyclopropanes
作者:Indrajit Das、Tarun K. Pal、Tanmaya Pathak
DOI:10.1021/jo701378d
日期:2007.11.1
Suitably designed vinylsulfone-modified furanosides act as substrates for Michael initiated ring closure reactions yielding cyclopropanated carbohydrates. The strategy is general in nature and gives access to cyclopropanes with predefined chiralities on three consecutive carbons with varying substitutions at the α-position.