3,4-dihydro-2H-pyran → tert-butyl(diphenyl){2-[3-(tetrahydro-2H-pyran-2-yloxy)cyclobutyl]ethoxy}silane

関与物質

反応手順

3-(2-{[Tert-butyl(diphenyl)silyl]oxy}ethyl)cyclobutanol (3.58 g, 10.1 mmol) was dissolved in dry tetrahydrofuran (50 mL) and 2,3-dihydro-4H-pyran and 4-toluenesulfonic acid pyridine salt were added and the reaction was stirred at room temperature for 48 hours. The reaction was concentrated in vacuo and purified on silica gel with a heptane-ethyl acetate gradient (5% ethyl acetate, then 20% ethyl acetate) to give crude tert-butyl(diphenyl){2-[3-(tetrahydro-2H-pyran-2-yloxy)cyclobutyl]ethoxy}silane (4.66 g, 105%) as a milky oil. Partial 1H NMR indicated a ˜4:1 mix of unknown cis-trans isomers. (CDCl3, δ ppm, key peaks are 4.05 (m, 0.80H), 4.30 (m, 0.20H), 4.52 (m, 0.20H), 4.56 (m, 0.80H).

情報源と証拠