A General and Diastereoselective Route to Five-Membered Carbocycles and Heterocycles from Acyclic Vinyl Sulfone-Modified Carbohydrates
作者:Ananta Kumar Atta、Tanmaya Pathak
DOI:10.1002/ejoc.200900957
日期:2010.2
acyclic vinyl sulfones having a suitably positioned leaving group reacted with externally delivered carbon, nitrogen, oxygen, and sulfur nucleophiles to afford a series of five-membered carbocycles and heterocycles in a diastereoselective fashion. This diversity-oriented synthetic method generates a wide range of chirally pure cyclic compounds from easily accessible starting materials and reagents
A Diastereoselective Unique Route to Cyclopropanes Functionalized at All Three Ring Carbon Atoms from Acyclic Vinyl Sulfone-Modified Carbohydrates
作者:Ananta Kumar Atta、Tanmaya Pathak
DOI:10.1021/jo802709q
日期:2009.4.3
In a departure from the current trend of using metal-catalyzed routes to cyclopropanation, pentosyl and hexosyl vinylsulfone-modifiedcarbohydrates having the terminal double bond and a suitably positioned leaving group are reacted in a stereoselective fashion with a series of nucleophiles to yield a myriad of cyclopropanes substituted at all three ring carbon atoms.