Phosphorus oxychloride → 2-Chloro-5-(3-methoxyphenyl)benzimidazole

Participants

Reaction Steps

Heat a mixture of 5-(3-methoxyphenyl)benzimidazolidin-2-one (1.4 g) and tetramethylammonium chloride (ca. 2 g) in phosphorous oxychloride at 100° C. for 8 hours. After cooling, concentrate the mixture in vacuo, triturate with water, and neutralize with ammonium hydroxide. Collect the precipitate and air-dry to obtain 2-chloro-5-(3-methoxyphenyl)benzimidazole. D. 1′-(5-(3-methoxyphenyl)-1H-benzimidazol-2-yl)-spiro[isobenzofuran-1,4′-piperidin]-3-one

Provenance & Evidence