Synthesis, Oxidation and Dehydro- genation of Cyclic N,O- and N,S-Acetals. Part 1. Transformation of N,S-Acetals: 3-Acyl-1,3,4-thiadiazolines
作者:László Somogyi
DOI:10.3987/com-04-10137
日期:——
Aldehyde and ketone thiosemicarbazones are synthesized and cyclized into 3-acyl-1,3,4-thiadiazolines under acylating conditions. Reactions of the 2-monosubstituted heterocycles with oxidizing and dehydrogenating agents (KMnO 4 or for the first time with CAN, DDQ, IBDA) lead to the formation of thiadiazoles. CAN oxidation of 2,2-disubstituted 3-acyl-1,3,4-thiadiazolines regenerates the parent ketones
醛和酮缩氨基硫脲在酰化条件下合成并环化成 3-酰基-1,3,4-噻二唑啉。2-单取代杂环与氧化剂和脱氢剂(KMnO 4 或首次与 CAN、DDQ、IBDA)反应导致形成噻二唑。2,2-二取代 3-acyl-1,3,4-thiadiazolines 的 CAN 氧化可有效地再生母体酮。