Thionyl Chloride → 5-Chloromethyl-2-(2-thienyl)benzoxazole

関与物質

反応手順

To 2-(2-thienyl)-5-benzoxazolylmethanol (600 mg) was added thionyl chloride (3 ml) at 0° C., stirred for 3 hours. The reaction mixture was concentrated, which was neutalized with saturated aqueous sodium bicarbonate, and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried (MgSO4), and concentrated under reduced pressure to give crystals of 5-chloromethyl-2-(2-thienyl) benzoxazole (550 mg, 85%). The recrystalization from ethyl acetate-hexane gave colorless needles, mp 152-153° C.

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