in methanol 6.5 h; Irradiation;

Yield given. Multistep reaction. Title compound not separated from byproducts;

N,N,N',N,-tetramethylethylenediamine; chloroformic acid ethyl ester; lithium diisopropyl amide Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;