Dimethylformamide dimethyl acetal → 6-Benzyloxy-3-(dimethylamino-methyleneamino)-7-methoxy-naphthalene-2-carboxylic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

In a round bottom flask containing 10 mL of toluene is added 3-amino-6-benzyloxy-7-methoxynaphthalene-2-carboxylic acid tert-butyl ester (3.0 g, 7.9 mmol) and dimethylformamide dimethyl acetal (5.4 mL, 31.6 mmol) under a positive nitrogen flow. The mixture is stirred at 120° C. for 1.5 hour, then is cooled to room temperature. The volatiles are removed under reduced pressure and the resulting residue is dried in vacuo for 15 h to yield 3.0 g of 6-benzyloxy-3-(dimethylamino-methyleneamino)-7-methoxy-naphthalene-2-carboxylic acid tert-butyl ester as a dark oil.

Provenance & Evidence