It is demonstrated that the [3+2] cycloaddition of a nitrone to an alkyne is facile when the length of the tether connecting the two reacting sites is appropriate. The resulting [3+2] cycloaddition products, isoxazolidines can be further converted to 3-hydroxy-3-pyrrolin-2-ones and alpha-keto-beta, gamma-unsaturated esters by reductive and oxidative cleavage, respectively.
Electrotelluration: A New Approach to Tri- and Tetrasubstituted Alkenes
作者:Joseph P. Marino、Hanh Nho Nguyen
DOI:10.1021/jo0110146
日期:2002.9.1
described in which a Michael addition of an alkyl or aryl tellurolate anion occurs onto an activated alkyne with subsequent trapping of a vinyl anion with electrophiles (aldehydes and ketones) other than a proton. This process provides an efficient regio- and stereospecific route to tri- and tetrasubstitutedalkenes. Methodologically significant examples of this chemistry were studied in which aryl and alkyl
作者:Han-Young Kang、Yong Seo Cho、Hun Yeong Koh、Moon Ho Chang
DOI:10.1016/0040-4039(91)85084-i
日期:1991.6
It is demonstrated that the [3+2] cycloaddition of a nitrone to an alkyne is facile when the length of the tether connecting the two reacting sites is appropriate. The resulting [3+2] cycloaddition products, isoxazolidines can be further converted to 3-hydroxy-3-pyrrolin-2-ones and alpha-keto-beta, gamma-unsaturated esters by reductive and oxidative cleavage, respectively.