1: N,N-dimethylmethylacetylene With n-butyllithium 2: oxirane

1: 1,1-Dibromo-3-methyl-1-butene With n-butyllithium in tetrahydrofuran; hexane T=-78 - 0°C; Inert atmosphere; 2: With trimethylaluminum in tetrahydrofuran; hexane T=0°C; 0.5 h; Inert atmosphere; 3: oxirane in tetrahydrofuran; hexane T=0 - 20°C; Inert atmosphere;

(i), (ii) NaNH2, liq. NH3; Multistep reaction;