1: MeCH=CHCO2Et With N,N'-dimethyl-N,N'-propyleneurea; n-butyllithium; diisopropylamine in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: chloro-trimethyl-silane in tetrahydrofuran; hexane T=-78 - 20°C;

N,N'-dimethyl-N,N'-propyleneurea; n-butyllithium; N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=20°C; 2 h;

n-butyllithium; N-ethyl-N,N-diisopropylamine in tetrahydrofuran T=20°C; 2 h;

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