Chlorination of acyclic β-diketones with triphenylphosphine-carbon tetrachloride and the other chlorinating reagents afforded β-chloro-β,γ-unsaturated ketones except when the terminal alkyl group was methyl or t-butyl. Unsymmetrical acyclic β-diketones yielded a mixture of the products chlorinated on each carbonyl carbon.
An Improved Synthesis of 2<i>H</i>-1,2,6-Thiadiazine 1,1-Dioxides by Condensation of β-Amino and β-Chloro α,β-Unsaturated Ketones with Sulfamides
作者:Angel Alberola、José M. Andrés、Alfonso González、Rafael Pedrosa、Martina Vicente
DOI:10.1055/s-1991-26464
日期:——
Symmetrically substituted β-amino α, β-unsaturated ketones react with sulfamide giving 2H-1,2,6-thiadiazine 1,1-dioxides in excellent yields. Unsymmetrically substituted β-amino and β-chloro α, β-unsaturated ketones also react with benzylsulfamide to yield thiadiazine derivatives in good chemical yields and excellent regioselectivity.