反应详情

A reaction mixture consisting of 2.63 gm. (0.01 mole) 4-(p-chlorophenyl)-4-dimethylaminocyclohexanone (prepared as in Preparation I, Part i, above), 0.87 ml. morpholine, 0.05 gm. para-toluenesulfonic acid, and 40 ml. benzene is heated at the reflux temperature for seven (7) hours in a reaction vessel fitted with a Dean and Stark trap. The benzene is then removed by evaporation under reduced pressure. The residue thus obtained is dissolved in 10 ml. tetrahydrofuran, to which solution is added 0.76 gm. (0.02 mole) sodium borohydride in 35.0 ml. absolute ethanol. This reaction mixture is heated at the reflux temperature for seventeen (17) hours, after which heating the tetrahydrofuran and ethanol are removed by evaporation under pressure. The residue thus obtained is dispersed in a mixture of water and diethyl ether. After vigorous shaking and allowing the aqueous and organic phases to separate, the organic phase is recovered. It is washed first with water and then with brine. The ether is then allowed to evaporate. The residue thus obtained is transferred onto a 1 inch by 4 foot column of silica gel averaging 20 to 50 microns in size, for purposes of high pressure liquid chromatographic (HPLC) purification. The chromatogram is developed with a solvent system consisting of 5% methanol in chloroform with 1% triethylamine. The fractions of eluate containing the object compound yield a solid which is recrystallized from aqueous methanol to give 0.95 gm. (30% yield) of 1-(p-chlorophenyl)-1-dimethylamino-4-morpholinocyclohexane having a melting point at 103° to 105° C.

1. customfitted with a Dean and Stark trap
2. customThe benzene is then removed by evaporation under reduced pressure
3. customThe residue thus obtained
4. dissolutionis dissolved in 10 ml
5. customare removed by evaporation under pressure
6. customThe residue thus obtained
7. customto separate
8. customthe organic phase is recovered
9. washIt is washed first with water
10. customto evaporate
11. customThe residue thus obtained
12. customis transferred onto a 1 inch by 4 foot column of silica gel averaging 20 to 50 microns in size, for purposes of high pressure liquid chromatographic (HPLC) purification
13. additionThe fractions of eluate containing the object compound
14. customyield a solid which
15. customis recrystallized from aqueous methanol
16. customto give 0.95 gm