Dihydrobenzofuran → 2,3-Dihydrobenzofuran-5-carboxaldehyde

Temperatur

0 °C

To a stirred solution of α,α-dichloromethyl methyl ether (2.15 g, 19 mmol, 1.35 eq) in methylene chloride (30 mL) at -40° C. was added successively stannic chloride (1.65 g, 17 mmol, 1.2 eq) and 15 minutes later, a solution of 2,3-dihydrobenzofuran (1.68 g, 14 mmol) in CH2Cl2 (5 mL) maintaining the temperature at or below -35° C. The mixture was warmed to 0° C., stirred 1 hour, then poured into ice-water, and stirred a further 30 minutes. The mixture was diluted with ether, and the phases separated. The organic phase was concentrated in vacuo, and the residue purified by vacuum distillation to yield the title compound (1.25 g, 60%) as a colorless liquid. b.p. 119°-121° C. at 0.3 mm Hg.

1. stirringstirred a further 30 minutes
2. customthe phases separated
3. concentrationThe organic phase was concentrated in vacuo
4. distillationthe residue purified by vacuum distillation

ORD-Eintrag

ord-aeae02a3858c4f9190646450ed5f9a61

Quelldatensatz

uspto-grants-1997_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05622971