N-bromobutanimide → N-(2-ethoxy-5,6-difluorophenethyl)-N'-(5-bromopyrid-2-yl)-urea

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Reaction Steps

The methods described in Example 151 of WO 93/03022 was then used to transform this compound to 2-ethoxy-5,6-difluoro-phenethylamine. The method described in Example 411 of WO 93/03022 was then used to prepare N-(2-ethoxy-5,6-difluorophenethyl)-N'-(5-bromopyrid-2-yl)-thiourea. This product was then oxidised with NBS as Example 4 to provide N-(2-ethoxy-5,6-difluorophenethyl)-N'-(5-bromopyrid-2-yl)-urea. 1H-NMR (250 MHz, CDCl3): 1.4 (t, 3H), 3.0 (q, 2H), 3.95 (q, 2H), 6.5 (m, 1H), 6.8 (d, 1H), 6.95 (dd, 1H), 7.68 (dd, 1H), 8.90 (d, 1H) 8.9 (s, 1H), 9.0 (s, 1H).

Provenance & Evidence