Synthesis of Polysubstituted Bicyclo[3.3.1]nonane-3,7-diones from Cyclohexa-2,5-dienones and Dimethyl 1,3-Acetonedicarboxylate
作者:Pelayo Camps、Albert González、Diego Muñoz-Torrero、Montserrat Simon、Adriana Zúñiga、Miriam A. Martins、Mercè Font-Bardia、Xavier Solans
DOI:10.1016/s0040-4020(00)00680-3
日期:2000.10
Oxidation of polysubstituted phenols with phenyliodonium diacetate gives cyclohexa-2,5-dienones, which on reaction with dimethyl 1,3-acetonedicarboxylate afford double-Michael-addition derivatives, whose hydrolysis and decarboxylation provides polysubstituted bicyclo[3.3.1]nonane-3,7-diones. For steric and/or electronic reasons, the Michael reaction only works with 3,5-unsubstituted or 3-substituted
Iodobenzene and m-chloroperbenzoic acid mediated oxidative dearomatization of phenols
作者:Neha Taneja、Rama Krishna Peddinti
DOI:10.1016/j.tetlet.2016.07.078
日期:2016.8
iodobenzene, and m-CPBA as a co-oxidant has been achieved via in situ generation of PhIO2, a hypervalent iodine(V) species. The transiently generated orthobenzoquinone monoketals further underwent Diels–Alderreaction with various dienophiles to furnish densely substituted bicyclo[2.2.2]octenones in high selectivities and yields. This methodology features ready availability of reagents, cost effectiveness, safety
regioselective C–P cross coupling reaction of p-quinol ethers with secondary phosphine oxides is reported. The reaction provides a facile alternative method for the synthesis of 2-phosphinylphenols in good to high yields. Mechanistically, zinc triflate may serve as an oxophilic σ-Lewis acid to activate the C–O bond in p-quinol ether first. Then the regioselective attack of the phosphorus nucleophile at the α-carbon
Site-selective 1,3-double functionalization of arenes using <i>para</i>-quinol, C–N, and C–C/C–P three-component coupling
作者:Saddam Husen、Anil Chauhan、Ravindra Kumar
DOI:10.1039/c9gc04103f
日期:——
A catalytic and site-selective approach has been demonstrated for dual functionalization of arenes via cross-coupling reactions of p-quinols with amines and isocyanides/phosphites.
new twist: A one‐pot nitrous acid free, diazonium‐free, and transition‐metal‐free variation of the Fischer indole synthesis has been developed. Condensation of quinone monoketals and aliphatic hydrazine hydrochlorides afforded indoles via intermediate alkylaryldiazenes. This method will complement the classical Fischer indole synthesis by providing indoles in two steps from widely available phenols