Acetic Acid → 2-[3-(4-Phenoxy-phenyl)-ureido]-thiophene-3-carboxylic acid tert-butyl ester

関与物質

反応手順

To a solution of t-butyl 2-amino-thiophene-3-carboxylate (0.6 g) in dry pyridine (20 ml) was added 4-phenoxyphenylisocyanate (0.84 g). The mixture was stirred for 48 h, then the dark coloured solution was poured into water (200 ml). The stirred mixture was acidified with acetic acid and a precipitate slowly solidified to give a brown solid. After about 1 hr, the solid was filtered off, dried in vacuo and recrystallised from acetonitrile, giving an off-white solid. MP=203-205° C. Yield=0.6 g (48.8%).

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