simple method for the synthesis of enol carbamates by irradiation with microwaves under solvent-free -conditions has been developed. The method has been applied to substituted acetophenones, cyclic aryl ketones and α-aryl ketones. Its main advantages are short reaction times, good conversions -except for nitro acetophenones, and the environmentally friendly nature of the process. For α-aryl ketones the
Stereoselective Intermolecular Carbolithiation of Open-Chain and Cyclic 1-Aryl-1-alkenyl N,N-Diisopropylcarbamates Coupled with Electrophilic Substitution. Observation of p-Carboxylation in a Benzyllithium Derivative
作者:Jan Georg Peters、Michael Seppi、Roland Fröhlich、Birgit Wibbeling、Dieter Hoppe
DOI:10.1055/s-2002-20040
日期:——
1-Aryl-1-alkenyl N,N-diisopropylcarbamates (1) are obtained from alkyl aryl ketones and N,N-diisopropylcarbamoyl chloride (CbCl) by heating with excess pyridine. These undergo facile syn-carbolithiation by alkyllithium/diamine and produce configurationally stable lithiated benzyl carbamates, which have been trapped with different electrophiles. If the reaction is carried out in the presence of chiral