1-Propanol, 2-methyl-2-[(tetrahydro-2H-pyran-2-yl)oxy]- synthesis

Yield:956079-44-0 100%

Reaction Conditions:

with lithium aluminium hydride;sodium sulfate decahydrate powder in tetrahydrofuran at 0 - 20; for 2.5 h;Inert atmosphere;

Steps:

44

To a solution of methyl 2-methyl-2-(tetrahydro-2H-pyran-2-yloxy)propanoate (1.25 g, 6.16 mmol) in THF (20 ml) under nitrogen was added portionwise lithium aluminium hydride (0.246 g, 6.16 mmol) at 0° C. and the reaction mixture was stirred 2 h, followed by slow addition of Na₂SO₄.10H₂O (1.98 g, 6.16 mmol). After 30 minutes of stirring at 0° C. to room temperature, the insoluble materials were filtered off. The filtrate was concentrated in vacuo to give 2-methyl-2-(tetrahydro-2H-pyran-2-yloxy)propan-1-ol (1.16 g, 6.68 mmol, quant.) as a colorless oil which was used in the next step without further purification. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 1.11 (s, 6H) 1.29-1.62 (m, 5H) 1.67-1.80 (m, 1H) 3.19-3.31 (m, 2H) 3.34-3.43 (m, 1H) 3.77-3.88 (m, 1H) 4.40 (t, J=5.94 Hz, 1H) 4.75-4.81 (m, 1H).

References:

US2011/53921,2011,A1 Location in patent:Page/Page column 26