Acetal−Vinyl Sulfide Cyclization on Sugar Substrates: Effect of Structure and Substituent
作者:Pradip K. Sasmal、Martin E. Maier
DOI:10.1021/jo026163i
日期:2003.2.1
vinyl or propenyl side chain. Extension of the alkene by a Suzuki cross-coupling reaction with 1-bromo-1-(phenylthio)ethene gave thioenol ethers as the cyclization substrates. The treatment of these substrates with BF(3).Et(2)O in tert-butylmethyl ether below 0 degrees C induced cyclization to optically active bicyclic ethers. If the cyclizations are carried out in toluene as the solvent, the isomerization