Heterocycles p. 75 - 85 (2016)
Update date:2022-08-29
Topics:
Kiyani, Hamzeh
Jalali, Mozhgan Sadat
The N,N-dimethylbenzylamine (DMBA) has been used as an efficient, inexpensive, and commercially available organocatalyst for the one-pot, three-component synthesis of tetrahydrobenzo[b]pyrans in good to high yields. It was found that the one-pot Knoevenagel-Michael-Thorpe-Ziegler cyclization sequence of dimedone, malononitrile/ethyl cyanoacetate, and various aldehydes was efficiently implemented in ethanol at 45 °C. This procedure offers attractive several features: mild reaction conditions, use of ethanol as a green solvent, reusability the reaction media, shorter reaction times, and the ease of the work-up.
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