and cyclobutanes via radical chemistry is described. The method that generally proceeds in high yields uses epoxides as radical precursors and titanocene(III) complexes as the electron transfer catalysts (see scheme). The key to the success of the transformation is constituted by the chemoselectivity of radical reduction. Electrophilic enol radicals generated through cyclization are reduced rapidly
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.
Lapkin,I.I.; Dvinskikh,V.V., Journal of general chemistry of the USSR, 1978, vol. 48, p. 2278 - 2280
作者:Lapkin,I.I.、Dvinskikh,V.V.
DOI:——
日期:——
Lapkin,I.I.; Fotin,V.V., Journal of Organic Chemistry USSR (English Translation), 1975, vol. 11, p. 2360 - 2362