反应详情

Compounds of formula III where n is zero and B is an oxo group can be prepared, for example, by oxidatively cleaving an optionally esterified tartaric acid; for example, using lead tetraacetate at room temperature in an organic solvent such as benzene. The resulting glyoxalic acid derivative is subsequently condensed in a conventional manner, e.g., conveniently in the presence of an amine, with propionaldehyde at an elevated temperature, e.g., at a temperature between 60° C. and 110° C. with water cleavage to yield the corresponding 3-formyl-crotonic acid derivative.

1. customat room temperature
2. customcondensed in a conventional manner, e.g.