Stereospecific debenzylative cycloetherification of carbohydrate-derived allylic alcohols, ethers and esters to form vinyl C-furanosides
作者:Riccardo Cribiù、Ian Cumpstey
DOI:10.1039/b718060h
日期:——
Benzyl ether protected polyhydroxylated alkene compounds containing allylic alcohol, ether or ester functionality undergo a stereospecific cyclisation reaction upon treatment with TFA-acetonitrile-toluene with inversion of configuration at the allylic position and loss of a benzyl ether to give tetrahydrofurans.
Formation and selective rupture of 1,4-anhydroseptanoses
作者:Raghu Vannam、Aditya R. Pote、Mark W. Peczuh
DOI:10.1016/j.tet.2016.12.031
日期:2017.1
Formation 1,4-anhydroseptanose sugars via intramolecular attack of a benzyl ether oxygen onto an anomeric electrophile is reported. The regioselectivity of the cyclization was confirmed by NMR spectroscopy and an X-ray structure of a glucose-derived 1,4-anhydroseptanose. The transformation is relatively general and was applied to septanoses derived from glucose, mannose, xylose, and galactose. Regioselective