Construction of Aromatic [5,5] Spiroketals via Hypoiodite-Catalyzed Etherification Combined in Relay Cascades
摘要:
An approach is developed for the synthesis of bisbenzannelated spiro[5,5]ketals via a catalytic relay reaction cascade involving a new cycloetherification, which is prompted by fluoride and catalyzed by the hypoiodite species generated in situ from irradiative aerobic oxidation of an iodide ion formed in the former step of the reaction cascade.
Mild and rapid method for the generation of o-quinone methide intermediates. Synthesis of puupehedione analogues
作者:Alejandro F. Barrero、José F. Quílez del Moral、M. Mar Herrador、Pilar Arteaga、Manuel Cortés、Julio Benites、Antonio Rosellón
DOI:10.1016/j.tet.2006.04.004
日期:2006.6
A route to simpler analogues to bioactive puupehedione derivatives involving a hetero Diels–Alder cycloaddition of a o-quinonemethide is described. These intermediate species are generated via fluoride-induced desilylation of silyl derivatives of o-hydroxybenzyl iodides. Remarkable short reaction times and very mild experimental conditions are the main features of this method.
Diastereoselective aldol-type interception of phenolic oxonium ylides for the direct assembly of 2,2-disubstituted dihydrobenzofurans
作者:Kemiao Hong、Xiangji Yang、Zhijing Zhang、Xiongda Xie、Xin Lv、Xinfang Xu、Wenhao Hu
DOI:10.1039/d2ob00723a
日期:——
interception of phenolic oxonium ylides with isatins has been developed, which provides an effective access to 2,2-disubstituted dihydrobenzofuran derivatives containing 3-hydroxyoxindole in high yields and with high diastereoselectivities under mild reaction conditions. The antiproliferation activity of these synthesized dihydrobenzofuran and 3-hydroxyoxindole hybrid products has been tested via the CCK8