Synthesis of 2,2-functionalized benzo[1,3]dioxoles
摘要:
Highly functionalized catechol ketals exhibiting either a tert-butyl moiety or a spiro center in position 2 are synthesized by ketalization and functionalized in a sequence of subsequent transformations. By a specific ketalization protocol catechol ketals of enolizable beta-keto esters can be prepared. With the succeeding steps these compounds incorporate moieties, which are not compatible and accessible by direct ketalization of catechol. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of 2,2-functionalized benzo[1,3]dioxoles
作者:Nader M. Boshta、Martin Bomkamp、Siegfried R. Waldvogel
DOI:10.1016/j.tet.2009.02.053
日期:2009.5
Highly functionalized catechol ketals exhibiting either a tert-butyl moiety or a spiro center in position 2 are synthesized by ketalization and functionalized in a sequence of subsequent transformations. By a specific ketalization protocol catechol ketals of enolizable beta-keto esters can be prepared. With the succeeding steps these compounds incorporate moieties, which are not compatible and accessible by direct ketalization of catechol. (C) 2009 Elsevier Ltd. All rights reserved.
Stereoselective Formation of Triphenylene Ketals
作者:Nader M. Boshta、Martin Bomkamp、Gregor Schnakenburg、Siegfried R. Waldvogel
DOI:10.1002/chem.200903249
日期:2010.3.15
stereoisomer of the corresponding triphenylene ketal. The concomitant metal salts of the oxidative coupling most probably form a multinuclear template that directs the diastereoselectivity in a subsequent isomerization step under electrophilic conditions. Several functionalities can serve as coordination sites for the multinuclear metal chloro clusters. Suitable functional groups have to be stable towards the