The Acid and/or Thermal Mediated Ring Contraction of 4H‑1,2,6-Thiadiazines To Afford 1,2,5-Thiadiazoles
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A near-quantitative acid and/or thermal mediated ring contraction of 3′,5′-diarylspiro(benzo[d][1,3]dioxole-2,4′-[1,2,6]thiadiazines) affords 3-aryl-4-(2-arylbenzo[d][1,3]dioxol-2-yl)-1,2,5-thiadiazoles. The reaction scope was studied providing 11 examples of this ring contraction. A double Wagner–Meerwein reaction mechanism is proposed.
创建时间：
2016-08-15
