Cyclopropanation of tin-substituted acetals with olefinic alcohols via in situ transacetalization
作者:Masanobu Sugawara、Jun-ichi Yoshida
DOI:10.1016/s0040-4039(99)00035-0
日期:1999.2
Reactions of a tin-substituted acetal with olefinic alcohols in the presence of an acid resulted in facile transacetalization followed by intramolecular cyclopropanation to give the cyclized products in high yields and stereoselectivity.
Copper-Catalyzed Oxaziridine-Mediated Oxidation of C–H Bonds
作者:Hashim F. Motiwala、Belgin Gülgeze、Jeffrey Aubé
DOI:10.1021/jo3012336
日期:2012.8.17
bonds has been observed via copper-catalyzed reactions of oxaziridines. The oxidation proceeded with a variety of substrates, primarily comprising allylic and benzylic examples, as well as one example of an otherwise unactivated tertiary C–H bond. The mechanism of the reaction is proposed to involve single-electrontransfer to the oxaziridines to generate a copper-bound radicalanion, followed by hydrogen
A Re2O7 catalyzed cycloetherification of monoallylic diols is described. The reaction features short reaction time, mild reaction conditions and exclusive E selectivity. A wide range of monoallylic alcohols with alkyl or aryl substituents on olefin smoothly undergo ring closure to deliver corresponding oxa-heterocycles. The reaction is also operationally simple and not sensitive to air and moisture
描述了Re 2 O 7催化的单烯丙基二醇的环醚化。该反应具有反应时间短,反应条件温和和E选择性高的特点。烯烃上具有烷基或芳基取代基的各种单烯丙基醇可平稳地进行闭环反应,以生成相应的氧杂杂环。该反应在操作上也很简单,并且对空气和湿气不敏感。
Stereoselective synthesis of side chain-functionalized tetrahydropyrans from 5-hexenols
作者:Patrick Fries、Melanie Kim Müller、Jens Hartung
DOI:10.1016/j.tet.2013.12.019
日期:2014.2
products of 6-exo-bromocyclization, as exemplified by synthesis of diastereomerically pure 2,4,6-substituted tetrahydropyrans. The cobalt method extends to intermolecular alkene/alkanol cross-coupling and to multi-component reactions between dimethyl fumarate, CHD, a 5-hexenol, and dioxygen, providing α-tetrahydropyranyl-2-methyl succinates in synthetically useful yields.
Diastereoselective Synthesis of α,α′-Disubstituted Oxygen Heterocycles † †The authors wish to dedicate this paper to the memory of Professor Paul Dowd (1936–1996).
作者:Donald C. Craig、Gavin L. Edwards、Craig A. Muldoon