TY - JOUR ID - 110144 TI - Biginelli reaction catalyzed by elemental bromine as a novel Lewis acid catalyst, under mild conditions JO - Eurasian Chemical Communications JA - ECC LA - en SN - 2717-0535 AU - Kolvari, Eskandar AU - Arab, Ali AU - Robati, Maryam AD - Department of Chemistry, Semnan University, P.O. BOX 35195-363, Semnan, Iran Y1 - 2020 PY - 2020 VL - 2 IS - 8 SP - 909 EP - 915 KW - Elemental bromine KW - Multi-component KW - One-pot synthesis KW - Biginelli reaction KW - Quantum computations DO - 10.22034/ecc.2020.110144 N2 - In the present study, we discussed that, the elemental bromine is a highly efficient and selective homogeneous Lewis acid catalyst for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones. Biginelli three-component condensation was carried out by the reaction of an aromatic aldehyde, urea/thiourea, and methyl/ethyl acetoacetate in ethanol, to afford the desired product in high yields. The influence of reaction parameters including the solvent type and the bromine quantity on catalytic activity were also investigated. In addition, the quantum computations were employed to clarify the effect of the Lewis acid catalyst. The structure of the products was validated using the FT-IR, 1HNMR, and 13CNMR. Our procedure offered several advantages including, the mild reaction conditions, employing an inexpensive catalyst, and easy workup. UR - https://www.echemcom.com/article_110144.html L1 - https://www.echemcom.com/article_110144_01c9de1fd8758a8dc9b3b7e8e39eb8bb.pdf ER -