Catalyst-Free Chemoselective Synthesis of 3,4-Dihydroquinazoline-2-thiones and 2‑Imino[1,3]benzothiazines
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A solvent-controlled catalyst-free chemoselective reaction was developed. Both 3,4-dihydroquinazoline-2-thiones and 2-imino[1,3]benzothiazines could be efficiently constructed by the reaction of 2-amino chalcones with isothiocyanates via two different chemoselective reactions depending on the solvents. The reaction was modulated by the solvents to proceed via either aza-Michael addition or thia-Michael addition as the major reaction with excellent yields.
创建时间：
2016-10-31
