1: methyl β-nitropropionate With N,N'-dimethyl-N,N'-propyleneurea; n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 0.5 h; Inert atmosphere; 2: ethyl iodide in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere;

Yield given. Multistep reaction. Yields of byproduct given;