Allyl bromide → 3-Chloro-4-(prop-2-en-1-yloxy)benzaldehyde

온도

65 °C

To a solution of 3-chloro-4-hydroxybenzaldehyde (5.0 g, 31.9 mmol) in DMF/THF 1:3 (120 mL) is added NaH (1.67 g of a 55% dispersion in mineral oil, 38.3 mmol) in four portions. The mixture is stirred at it for 1 h before allylbromide (9.66 g, 79.8 mmol) is added. The reaction mixture is heated to 65° C. for 18 h, diluted with water (250 mL) and extracted with diethyl ether (3×250 mL). The organic extracts are washed with water (250 mL), combined and concentrated. The remaining oil is chromatographed on silic gel with heptane/EA 4:1 to afford 4-allyloxy-3-chlorobenzaldehyde (5.37 g) as an almost colourless oil. LC: tR=0.95 min. The above 4-allyloxy-3-chloro-benzaldehyde (5.37 g, 27.3 mmol) is dissolved in acetone (100 mL) and water (10 mL) and treated with a 2.5% solution of OsO4 in tert.-butanol (1.71 mL, 0.137 mmol OsO4). N-methyl morpholine-N-oxide (3.87 g, 32.8 mmol) is added and the reaction mixture is stirred at it for 20 h before it is diluted with EA (300 mL) and washed with 10% aq. citric acid solution (200 mL) and water (2×150 mL). The washings are extracted with EA (300 mL) and the combined organic extracts are dried over MgSO4, filtered and concentrated to furnish the title compound (6.02 g) as beige foam which was used in the following steps without further purification. LC: tR=0.67 min.

1. additionis added
2. extractionextracted with diethyl ether (3×250 mL)
3. washThe organic extracts are washed with water (250 mL)
4. concentrationconcentrated
5. customThe remaining oil is chromatographed on silic gel with heptane/EA 4:1

ORD 기록

ord-efdd7b2b5a174c7a98caa0fdc960d51b

출처 데이터셋

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

USRE045174E1