Cyclocondensation of nitromalonaldehyde sodium salt with substituted 1-amino-3-butanones afforded 2-dimethyl-, diethylaminomethyl-4-nitrophenols and 2-piperidylo-, morpholylomethyl-4-nitrophenols.
Facile Approach for the Synthesis of 2,3,4,9-Tetrahydro-1<i>H</i>-xanthen-1-ones and 8,9,10,12-Tetrahydro-11<i>H</i>-benzo[<i>a</i>]xanthen-11-ones via Trapping of <i>o</i>-Quinone Methides
作者:Vitaly A. Osyanin、Elena A. Ivleva、Yuri N. Klimochkin
DOI:10.1080/00397911.2010.545164
日期:2012.6.15
Abstract An efficient, simple synthesis of 2,3,4,9-tetrahydro-1H-xanthene-1-ones and 8,9,10,12-tetrahydro-11H-benzo[a]xanthen-11-ones is reported by one-pot condensation of 3-dimethylamino-2-cyclohexen-1-ones with hydroxybenzyl alcohols, phenol, and 2-naphthol Mannich bases or their quaternized derivatives. The mechanism of the reaction is believed to involve the formation of the o-quinone methide
The conversion of ortho-hydroxylated Mannich bases to the corresponding methylated compounds, e.g., cresols, can be effectively carried out using a novel hydrogenation technique.
A process for the synthesis of ortho-methylated hydroxyaromatic compounds
申请人:Bristol-Myers Squibb Company
公开号:EP0373668A2
公开(公告)日:1990-06-20
The conversion of ortho-hydroxylated Mannich bases to the corresponding methylated compounds, e.g., cresols, can be effectively carried out using a novel hydrogenation technique.