反应详情

Oxalyl chloride (5.00 ml) was added dropwise to a solution of dimethylformamide (4.43 ml) in acetonitrile (200 ml) at 0° C. The mixture was stirred for 20 mins. and a suspension of pyridine (9.66 ml) and 1-(1H-benzo[d]imidazol-2-ylsulfonyl-2-piperidinecarboxamide (14.73 g) [see Preparation 17] in acetonitrile (100 ml) was added over a period of 10 mins. The reaction mixture was stirred for a further 20 mins. after which time the solvent was removed under reduced pressure. The residue was diluted with diethyl ether and washed with water, brine, dried over magnesium sulphate and the solvent was removed under reduced pressure. The crude product was purified by column chromatography on silica gel eluting with 70:30, by volume, hexane:ethyl acetate to afford 1-(1H-benzo[d]imidazol-2-ylsulfonyl)-2-piperidinecarbonitrile (4.9 g).

1. stirringThe reaction mixture was stirred for a further 20 mins
2. customafter which time the solvent was removed under reduced pressure
3. additionThe residue was diluted with diethyl ether
4. washwashed with water, brine
5. dry with materialdried over magnesium sulphate
6. customthe solvent was removed under reduced pressure
7. customThe crude product was purified by column chromatography on silica gel eluting with 70:30, by volume, hexane