Microwave-Assisted Wolff Rearrangement of Cyclic 2-Diazo-1,3-Diketones: An Eco-compatible Route to α-Carbonylated Cycloalkanones
摘要:
The microwave-assisted Wolff rearrangement of cyclic 2-diazo-1.3-diketones performed in the presence of a stoichiometric amount of alcohol, amine, or thiol is an efficient, user, and environmentally friendly synthetic protocol for the synthesis of alpha-carbonylated cycloalkanones. This approach proves superior to existing protocols in scope and eco-compatibility.
1,1-Disubstituted-2,3,4,9-tetrahydro-1<i>H</i>-pyrido[3,4-<i>b</i>]indolecarboxylic acid esters and ketones. The base catalyzed transformation of 1-(2′,3′,4′,9′-tetrahydrospiro[cyclohexane-1,1′-[1<i>H</i>]pyrido[3,4-<i>b</i>]indol]-2-yl)alkanones into 2-(4,9-dihydro-3<i>H</i>-pyrido[3,4-<i>b</i>]indol-1-yl)-1 -alkylcyclohexanols
作者:George Bobowski、John Shavel
DOI:10.1002/jhet.5570220643
日期:1985.11
with cyclic β-keto esters2 under azeotropic conditions followed by acid-catalyzed ring closure of the resulting enamines 3 gave 2′,3′,4′,9′-tetrahydrospiro[piperidine-3,1′,-[1H]pyrido[3,4-b]indole] -4-carboxylic acid alkyl esters4. Condensation of 1 with 2-acylcycloalkanones 8 gave two types of enamines, 10 and 11, respectively. Enamines 10 on treatment with acid gave 1-(2′,3′,4′,9′-tetrahydro-3H-pyrido[3