Pyridine-facilitated phenylselenoetherification of some tertiary alkenols
作者:Biljana M. Mojsilovic、Zorica M. Bugaric
DOI:10.1002/hc.1072
日期:——
An improved procedure for intramolecular cyclization of tertiaryalkenols using benzeneselenyl halides has been developed. We found that cyclization can be facilitated by pyridine. Thus, in the presence of an equimolar amount of pyridine, a chemospecific reaction could be observed that resulted in formation of corresponding cyclic ethers, and quantitative yields were achieved instantaneously under
Phenylselenoetherification of some Δ4-alkenols facilitated by pyridine and some Lewis acids
作者:Biljana M. Šmit、Zorica M. Bugarčić
DOI:10.1002/jhet.487
日期:2010.11
Studies on the phenylselenoetherification of some Δ4‐alkenols in the presence of pyridine and some Lewis acids are described. All alkenols underwent intramolecular cyclization yielding corresponding tetrahydrofuran or tetrahydropyran derivatives. Yield and diastereomeric ratio of the cyclic products depend on counterion of selenylating reagent used. We found that external additives, such as pyridine