Reaktion #2260441

Reaktionsgleichung

5-bromo-3,4-dihydro-1H-isochromene-1-carboxylic acid

→

(5-bromo-3,4-dihydro-1H-isochromen-1-yl)methanol

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigewise at 0° C
2. 2
   SonstigeThe reaction was quenched with water and aqueous sodium hydroxide (1 N, 2 mL)
3. 3
   workup.STIRRINGThe contents were stirred for 3 h
4. 4
   Extraktionextracted with EtOAc
5. 5
   SonstigeThe organic layer was dried
6. 6
   Einengenconcentrated

Vorschrift

A solution of 5-bromo-3,4-dihydro-1H-isochromene-1-carboxylic acid (0.500 g, 1.94 mmol) in 1 mL of THF was added BH3. THF (3.88 mL, 3.88 mmol) drop wise at 0° C. The mixture was stirred at 0° C. for 2 h. The reaction was quenched with water and aqueous sodium hydroxide (1 N, 2 mL). The contents were stirred for 3 h, and then extracted with EtOAc. The organic layer was dried and concentrated to give (5-bromo-3,4-dihydro-1H-isochromen-1-yl)methanol 1H-NMR (400 MHz, CDCl3) δ 7.41 (t, J=2.4 Hz, 1H), 6.97˜7.04 (m, 2H), 4.75˜4.77 (m, 1H), 3.88˜3.92 (m, 1H), 3.73˜3.79 (m, 2H), 2.71-2.86 (m, 2H).

Quelle