Cyclizationcycloaddition cascades for the construction of azapolycyclic ring systems
作者:Albert Padwa、William S. Kissell、Cheryl K. Eidell
DOI:10.1139/cjc-79-11-1681
日期:——
reaction. An alternate route for the synthesis of cyclic amidofurans was developed using a Pummerer in- duced cyclization of the thiophenyl substituted acetal derived from the aldol reaction of methoxyphenylsulfanyl acetaldehyde with a-valerolactam. Treatment of the amido-substituted acetal with dimethyl(methylthio)sulfonium tetrafluoroborate (DMTSF) generated an oxonium ion, which readily cyclized onto