Methanol → 4-t-Butylazo-4-cyanopentanol

温度

10 °C

To a 200 ml 3-neck bottom flask equipped with a magnetic stirrer, thermometer and addition funnel was added 10.3 grams (0.21 mole) of sodium cyanide and 80 mls of 75% aqueous methanol. The mixture was stirred at room temperature until the sodium cyanide dissolved. The solution was cooled to 10° C. and 49.7 grams (0.2 mole) of 4-t-butylazo-4-chloropentyl acetate was added dropwise over 20 minutes while holding the temperature at 10° to 15° C. with a cold water bath. After the addition was complete, the mixture was stirred an additional hour at room temperature before adding 13.2 grams (0.2 mole) of 85% potassium hydroxide. The resulting mixture was stirred an additional 1/2 hour at room temperature to complete the saponification of the acetate group. The reaction mixture was poured into 200 ml of water and the organic layer taken up in 100 ml pentane. The pentane solution was washed with water, 10% HCl, water and saturated sodium bicarbonate solution. The pentane solution was dried over anhydrous sodium sulfate, filtered and the pentane stripped off on a rotary evaporator under reduced pressure. The resulting light orange liquid weighed 11.0 grams (28% crude yield). The infrared spectrum of the product contained a sharp weak cyano band at 2200 cm-1 and a very strong broad hydroxyl peak at 3300 cm-1. The carbonyl band at 1730-1740 cm-1 and the carbon-oxygen band at 1230-1240 cm-1 were missing, indicating that the acetoxy group had been saponified.

1. customTo a 200 ml 3-neck bottom flask equipped with a magnetic stirrer
2. additionthermometer and addition funnel
3. dissolutiondissolved
4. customat 10° to 15° C.
5. additionAfter the addition
6. stirringThe resulting mixture was stirred an additional 1/2 hour at room temperature
7. washThe pentane solution was washed with water, 10% HCl, water and saturated sodium bicarbonate solution
8. dry with materialThe pentane solution was dried over anhydrous sodium sulfate
9. filtrationfiltered
10. customthe pentane stripped off on a rotary evaporator under reduced pressure

ORDレコード

ord-e01a81bc61ce45e2b19b2f9ec8fb7ba9

出典データセット

uspto-grants-1980_08

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04218370