Synthesis, characterization, and antifungal activity of novel (Z)-N-(2-cyano-3-phenylprop-2-en-1-yl)-alkyl/aryl-sulfonamides derived from a Morita–Baylis–Hillman adduct

摘要

A series of allyl sulfonamides prepared from the reaction of the Morita–Baylis–Hillman adduct 2-[hydroxy(phenyl)methyl]acrylonitrile with primary sulfonamides (RSO_2NH_2), where R = C_6H_5 (1), 4-F-C_6H_4 (2), 4-Cl-C_6H_4 (3), 4-Br-C_6H_4 (4), 4-NO_2-C_6H_4 (5), CH_3 (6), CH_3CH_2 (7), CH_3(CH_2)_3 (8), and CH_3(CH_2)_7 (9), were characterized by IR, 1H and 13C NMR spectroscopies, mass spectrometry and elemental analyses. BLYP/6-31G~* calculations suggested stereoselective reactions, resulting in the exclusive formation of the thermodynamically more stable Z-products. The Z-configuration of the products was confirmed by NOE difference spectroscopy and single crystal X-ray diffraction measurements. The allyl sulfonamides were active against Colletotrichum gloeosporioides, an important agent of anthracnose in plants.