反応 #81550

反応方程式

potassium iodide

sodium nitrite

4,4-dimethyl-7-amino-1-tetralone

→

title product

4,4-Dimethyl-7-iodo-1-tetralone

溶媒

water

water

hydrochloric acid

反応条件

後処理

1. 1
   workup.ADDITIONThe reaction mixture was then diazotized by the dropwise addition
2. 2
   その他between 0°-5° C
3. 3
   workup.WAITAfter standing for 30 minutes
4. 4
   抽出the dark gum was extracted with ethyl acetate (1×100 mL)
5. 5
   濃縮The organic phase was then concentrated in vacuo
6. 6
   その他the residue chromatographed on silica gel (eluted with 5% ethyl acetate in hexane)

実験手順

To a solution of 4,4-dimethyl-7-amino-1-tetralone (XII) (1.82 g, 10.0 mmol) in concentrated hydrochloric acid (4.69 mL) was added ice cold water (3.13 mL). The reaction mixture was then cooled to 0° C. by use of an ice-salt bath. The reaction mixture was then diazotized by the dropwise addition with stirring of a solution of sodium nitrite (0.76 g, 11.0 mmol) in water (3.13 mL) keeping temperature between 0°-5° C. After stirring for 15 minutes, the reaction mixture was added to a solution of potassium iodide (3.63 g, 21.9 mmol) in water (18.8 mL). After standing for 30 minutes, the dark gum was extracted with ethyl acetate (1×100 mL). The organic phase was then concentrated in vacuo and the residue chromatographed on silica gel (eluted with 5% ethyl acetate in hexane) to give 1.56 g (Y: 54%) of the title product; 1H-NMR (CDCl3): δ8.33 (d, J=2.0 Hz, 1H), 7.82 (dd, J=8.3, 2.0 Hz, 1H), 7.17 (d, J=8.4 Hz, 1H), 2.72 (t, J=6.8 Hz, 2H), 2.01 (t, J=6.8 Hz, 2H), 1.37 (s, 6H); MS (DCI) m/e: 301 (MH+).

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