Sodium Hydroxide → Benzyl 3-(2-amino-6-chloropyrimidin-4-yl)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

4.14 g (12.60 mmol) of benzyl 3-(2-amino-6-hydroxypyrimidin-4-yl)piperidine-1-carboxylate (from example LXXI) are suspended in 150 ml of acetonitrile. 3.29 ml (18.91 mmol) of N,N-diisopropylethylamine and 0.57 g (2.52 mmol) of benzyltriethylammonium chloride are added successively. The mixture is cooled to 0° C. At 0° C., 4.7 ml (50.43 mmol) of phosphoryl chloride are then slowly added dropwise. The mixture is stirred at room temperature for 18 hours. For work-up, the reaction solution is cooled to 0° C. and carefully added dropwise to ice water (150 ml). The aqueous suspension is neutralized using a 45% strength sodium hydroxide solution and extracted three times with ethyl acetate (in each case 70 ml). The organic phase is dried over anhydrous magnesium sulfate and concentrated. The residue is purified on a silica gel column using dichloromethane/methanol 30:1. This gives 2.80 g (64% of theory) of product.

Provenance & Evidence