3 -Nitro-benzylideneacetoacetic acid isopropylester

Nitro-benzylideneacetoacetic acid isopropylester Acetoacetic acid p-metoxyethyl ester Ammonium hydroxide... 

After 8 hours boiling of solution of 3.8 g of 3 -nitro-benzylideneacetoacetic acid isopropylester, 8 grams of acetoacetic acid p-metoxyethyl ester and 6 ml cone ammonia in 80 ml ethanol under reflux, 2,6-dimethyl-4-(3 -nitrophenyl)-1,4-dihydropyridine 3-p-methoxyethyl ester 5-isopropyl ester of melting point 125°C (petroleum ether/ acetic ester) was obtained. Yield 49% of theory. 

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