Реакция #215384

Уравнение реакции

2,3,4-tri-O-acetyl-1-thio-β-L-fucopyranose

1-bromohexadecane

triethylamine

→

hexadecyl 2,3,4-tri-O-acetyl-1-thio-β-L-fucopyranoside

Выход 55.1%

Растворители

dichloromethane

Условия реакции

Обработка

1. 1
   Другоеto give a syrup which
2. 2
   Промывкаeluted with 2-5% ethyl acetate in chloroform
3. 3
   Концентрированиеconcentrated to dryness
4. 4
   ДругоеCrystallization from aqueous ethanol

Методика

A solution of 2,3,4-tri-O-acetyl-1-thio-β-L-fucopyranose (2.0 g, 6.5 mmol) and 1-bromohexadecane (2.0 g, 6.5 mmol) in dichloromethane (40 ml) containing triethylamine (1 ml) is kept under nitrogen for 2 days at room temperature. The reaction is worked up in the usual manner to give a syrup which is put on a silica gel column and eluted with 2-5% ethyl acetate in chloroform. The desired fractions are pooled and concentrated to dryness. Crystallization from aqueous ethanol gives hexadecyl 2,3,4-tri-O-acetyl-1-thio-β-L-fucopyranoside (1.9 g, 55%), m.p. 49°-50°, [α]D +9° (c, 1.5, chloroform).

Источник