Process for preparing benzofuran derivatives

Details Process for preparing benzofuran derivatives Process for preparing benzofuran derivatives

C - Chemistry, Metallurgy

07

D

260/367, 260/361

C07D 307/83 (2006.01) C07D 295/03 (2006.01) C07D 307/82 (2006.01) C07D 405/04 (2006.01) C07D 413/04 (2006.01)

Patent

CA 1066702

ABSTRACT Compounds of the formula: Image I [wherein R1 and R2 may be the same or different and each is selected from the group consisting of hydrogen, an alkyl group and, together, an alkylene chain; and R3 is an alkyl group; R4 is selected from the group consisting of an alkyl group and, with R3 and the N atom, a heterocyclic ring] or derivatives thereof are prepared by reacting benzoquinone with an enamine R1R2C=CH-NR3R4 in the presence of a compound of formula R1R2CHCHO. The product contains a lower proportion of hydroquinone impurity and finds use in the preparation of herbicides.

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