Methanol → 4-Chloro-2-methoxybenzothiazole

Beteiligte Stoffe

Reaktionsschritte

A mixture (5 g, 0.023 mole) of 2-bromo-4-chlorobenzothiazole and 2,4-dichlorobenzothiazole and 1,5-diazabicyclo[5.4.0]undecene-5 (DBU) (3.8 g, 0.025 mole) were added to methanol (80 c.c.), and the mixture was heated under reflux for 4 hours. After cooling, water (150 c.c.) was added to the reaction solution, followed by ice-cooling. The deposited crystals were filtered and washed twice with water to obtain 4.23 g of 2-methoxy-4-chlorobenzothiazole. Yield 92.5%, purity 98.5%, m.p. 55°-57° C.

Herkunft & Nachweise