反应详情

Isopropyl N-cyano-3-pyridinecarboximidate (0.50 g, 2.6 mmol) was dissolved in methanol (10 ml), and aminodiphenylmethane (0.54 g, 2.9 mmol) was added. The mixture was stirred at room temperature for 1 hour. After the reaction was completed, the reaction solution was concentrated under reduced pressure. The residual concentrate thus obtained was subjected to chromatography on a silica gel column (WAKO GEL C-200, 40 g) eluting with chloroform-methanol (100:1). The eluted fractions were concentrated under reduced pressure to give N-cyano-N'-diphenylmethyl-3-pyridinecarboximidamide (0.48 g, 1.5 mmol, yield: 58%) as colorless syrup. Next, to this syrup was added a solution of 5% hydrogen chloride in methanol (2 ml) to form a solution. The solution was further crystallized from methanol-diethyl ether to give N-cyano-N'-diphenylmethyl-3-pyridinecarboximidamide hydrochloride as colorless powder.

1. concentrationthe reaction solution was concentrated under reduced pressure
2. concentrationThe residual concentrate thus
3. customobtained
4. washeluting with chloroform-methanol (100:1)
5. concentrationThe eluted fractions were concentrated under reduced pressure