Ethanol → 3-Methyl-3-prop-2-ynyloxymethyl-1-oxa-4-aza-spiro[4.5]decane

Beteiligte Stoffe

Reaktionsschritte

Sodium hydride (55% in dispersion in oil) (0.636 g) was added portion wise to a solution of (3-methyl-1-oxa-4-aza-spiro[4.5]dec-3-yl)-methanol (2.0 g) in dry THF (30 ml) at 0° C. The reaction mixture was stirred at room temperature for 1 h. Propargyl bromide (0.972 ml) was added dropwise at 0° C. and the resulting mixture was stirred at room temperature for 2.5 h. The reaction mixture was treated with ethanol (4 ml) and diluted with diethyl ether and the mixture was filtered. The filtrate was concentrated in vacuo to providing a crude residue which was purified by column chromatography (hexane/ethyl acetate 1:1) to give 2.33 g of 3-methyl-3-prop-2-ynyloxymethyl-1-oxa-4-aza-spiro[4.5]decane as an orange liquid. 1H NMR (CDCl3) δ ppm: 4.18 (2H, d); 3.82 (1H, d); 3.53 (1H, d); 3.43 (1H, d); 3.38 (1H, d); 2.42 (1H, t); 1.7-1.2 (10H, m); 1.25 (1H, s).

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