Reaktion #1441307

Reaktionsgleichung

sodium hydride

3-methyl-2-butanol

2-pentyn-1-ol

sodium hydride

4,6-dichloropyrimidine

ammonium chloride

→

4-(1,2-dimethylpropyloxy)-6-(2-pentynyloxy)pyrimidine

Ausbeute 66.0%

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added dropwise at 0° C.
2. 2
   workup.STIRRINGby stirring at 0° C. for 3 hours
3. 3
   workup.STIRRINGby stirring at room temperature for 4 hours
4. 4
   Extraktionwas extracted three times with t-butyl methyl ether
5. 5
   WaschenThe combined organic layers were washed with a saturated aqueous sodium chloride solution
6. 6
   Trocknendried over anhydrous magnesium sulfate
7. 7
   Einengenconcentrated

Vorschrift

In 4 ml of tetrahydrofuran was suspended 0.13 g of sodium hydride (60% in oil), to which 0.5 ml of a solution containing 0.24 g of 3-methyl-2-butanol was added dropwise at 0° C., followed by stirring for 10 minutes. To this was added dropwise 0.5 ml of a solution containing 0.40 g of 4,6-dichloropyrimidine in tetrahydrofuran, followed by stirring at 0° C. for 3 hours. To this was added dropwise 0.5 ml of a solution containing 0.29 g of 2-pentyn-1-ol in tetrahydrofuran and further added 0.15 g of sodium hydride (60% in oil), followed by stirring at room temperature for 4 hours. The reaction mixture was then poured into a saturated aqueous ammonium chloride solution, which was extracted three times with t-butyl methyl ether. The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and then concentrated. The residue was subjected to silica gel column chromatography to give 0.44 g of 4-(1,2-dimethylpropyloxy)-6-(2-pentynyloxy)pyrimidine (the present compound (22)).

Quelle