反应详情

To 27.5 ml. (about 6 equivalents) of diethylamine and 10 g. of molecular sieve 3A in 200 ml. of methanol are added at 0° C. 17.6 ml. of 5 N methanolic hydrochloric acid (2 equivalents) and then 9.4 g. of (1-phenyl-2,5-cyclohexadien-1-yl)-2-propanone in a small amount of methanol and finally 1.95 g. (0.7 equivalents) of sodium cyanoborohydride. The mixture is stirred at room temperature for 5 days and then worked-up in exactly the same manner as described in Example 16. There is obtained an oily residue which is chromatographed on a silica gel thick-layer plate with ethyl acetate/triethylamine (15:1). Two products are scratched off and eluted with methylene chloride/methanol (4:1). The product of RF 0.32 is α-methyl-N-ethyl-1-phenyl-2,5-cyclohexadien-1-ethylamine. The other product (RF 0.54) is the desired product, namely, α-methyl-N,N-diethyl-1-phenyl-2,5-cyclohexadien-1-ethylamine. This is converted as usual into the hydrochloride and recrystallized from methylene chloride/ether. According to melting point and mixed melting point, the product is identical with that obtained in accordance with Example 18.

1. customThere is obtained an oily residue which
2. customis chromatographed on a silica gel thick-layer plate with ethyl acetate/triethylamine (15:1)
3. washeluted with methylene chloride/methanol (4:1)
4. customrecrystallized from methylene chloride/ether
5. additionmixed
6. customthat obtained in accordance with Example 18