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Table 1 Yields of 3a at different reaction conditions

From: Synthesis, insecticidal, and antibacterial activities of novel neonicotinoid analogs with dihydropyridine

No. Solvent Base Time (h) Yield (%)
1 ethanol triethylamine 24 15.1
2 acetonitrile triethylamine 24 35.8
3 DMF triethylamine 24 25.4
4 1,4-dioxane triethylamine 24 12.6
5 acetonitrile K2CO3 24 33.2
6 acetonitrile pyridine 24 20.1
7 acetonitrile piperidine 24 51.4
8 acetonitrile piperidine 18 56.6
9 acetonitrile piperidine 12 42.2