A green protocol for water-tolerant iminium-type asymmetric Michael reaction cooperatively catalyzed by 1,2-di(quinoline)ethane-1,2-diamine/mandelic acid was proposed.

A novel method for the direct synthesis of 5-arylidene-2-thiohydantoins from thioureas and aromatic aldehydes in the presence of base in ethanol was developed. Application of this efficient method allowed preparing thiohydantoins, which are difficult to synthesis by traditional methods.

A convenient preparative method of the synthesis of dithienylethenes based on maleimides was proposed. Previously, difficult accessible dithienylethene derivatives, in which 2-thienyl substituents are attached to the double bond of maleimide, have been synthesized. The spectral properties of the dithienylmaleimides were studied and it has been shown that these compounds do not belong to photochromes but they possess fluorescent properties.

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