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Eco-friendly synthesis of fused pyrano[2,3-b]pyrans via ammonium acetate-mediated formal oxa-[3 + 3]cycloaddition of 4H-chromene-3-carbaldehydes and cyclic 1,3-dicarbonyl compounds.
Osyanin VA, Osipov DV, Semenova IA, Korzhenko KS, Lukashenko AV, Demidov OP, Klimochkin YN. Osyanin VA, et al. Among authors: korzhenko ks. RSC Adv. 2020 Sep 16;10(57):34344-34354. doi: 10.1039/d0ra06450e. eCollection 2020 Sep 16. RSC Adv. 2020. PMID: 35514419 Free PMC article.