反应详情

Sodium borohydride (3.14 g) was added to an ice-cold suspension of methyl 5-(bromoacetyl)thiophene-2-carboxylate (4.14 g) in methanol (250 ml). After 15 min the reaction mixture was poured into iced water (1000 ml) and extracted with ethyl acetate (5×200 ml). The dried (MgSO4) organic phase was evaporated to give a yellow oil, which was heted with [2-(4-methoxyphenyl)-1-methylethyl](phenylmethyl)amine (5.18 g) at 100° for 16 h. The cooled reaction mixture was partitioned between water (400 ml) and ethyl acetate (3×400 ml), and the dried (MgSO4) organic phase was evaporated, giving the crude product as an oily brown solid (9.75 g). This was applied on silica to a short-path silica column (1000 g) eluted with cyclohexane 15% diethyl ether. The appropriate fractions (Rf 0.15) were combined and evaporated to give the ethanolamine (slightly impure) as an oily beige solid (2.4 g). TLC SiO2 (Et2O/cyclohexane, 1:1 ) Rf 0.39.

1. extractionextracted with ethyl acetate (5×200 ml)
2. dry with materialThe dried (MgSO4) organic phase
3. customwas evaporated
4. customto give a yellow oil, which
5. customThe cooled reaction mixture
6. customwas partitioned between water (400 ml) and ethyl acetate (3×400 ml)
7. dry with materialthe dried (MgSO4) organic phase
8. customwas evaporated
9. customgiving the crude product as an oily brown solid (9.75 g)
10. washeluted with cyclohexane 15% diethyl ether
11. customevaporated