Intercalation of Multiple Carbon Atoms between the Carbonyls of α-Diketones
作者:Emily P. Balskus、José Méndez-Andino、Ruslan M. Arbit、Leo A. Paquette
DOI:10.1021/jo010494y
日期:2001.10.1
beneficial effect of facilitating removal of ruthenium and phosphorus byproducts generated during the metathesis step. This chemistry conveniently lends itself to the controlled intercalation of multiple methylene groups between the carbonyl carbons of readily available alpha-diketones to deliver linear or cyclic products.
Tandem Deployment of Indium-, Ruthenium-, and Lead-Promoted Reactions. Four-Carbon Intercalation between the Carbonyl Groups of Open-Chain and Cyclic α-Diketones
作者:José Méndez-Andino、Leo A. Paquette
DOI:10.1021/ol000037o
日期:2000.5.1
An efficient strategy for the conversion of 1,2-diketones into saturated 1,6-diketones and Delta(2,3)/Delta(3,4)-unsaturated congeners thereof is reported.
Functionalised bicyclic alcohols by enantioselective α-deprotonation–rearrangement of meso-epoxides†
作者:David M. Hodgson、Iain D. Cameron、Martin Christlieb、Rebecca Green、Gary P. Lee、Lesley A. Robinson
DOI:10.1039/b105369h
日期:——
Enantioselective α-deprotonationârearrangement of achiral substituted cyclooctene oxides 7, 27 and 28 and N-Boc hexahydroazonine oxide 45 using organolithiums in the presence of (â)-sparteine 3 or (â)-α-isosparteine 4 gives the functionalised bicyclo[3.3.0]octan-2-ols 9, 29, and 32 and indolizinol 47 in 50â72% yields and 83â89% ees.
Ring expansion of cyclic 1,2-diols to form medium sized rings via ruthenium catalyzed transfer hydrogenative [4+2] cycloaddition
作者:Zachary A. Kasun、Laina M. Geary、Michael J. Krische
DOI:10.1039/c4cc03983a
日期:——
A new method for the ring expansion of cyclic diols is described. Using improved conditions for the ruthenium(0) catalyzed cycloaddition of cyclic 1,2-diols with 1,3-dienes, fused [n.4.0] bicycles 3a–3r (n = 3–6) are formed, which upon exposure to iodosobenzene diacetate engage in oxidative cleavage to form the 9–12 membered rings 4a–4r.