Regioselective Reactions of Pyridine-2-sulfenyl Bromide with Vinyl and Allyl Ethers
作者:R. S. Ishigeev、S. V. Amosova、V. A. Potapov
DOI:10.1134/s1070363222090146
日期:2022.9
Abstract Annulation reactions of pyridine-2-sulfenyl bromide with vinyl and allyl ethers proceeded regioselectively, but with opposite regiochemistry. Reactions with vinyl ethers led to 3-organyloxy-2,3-dihydro[1,3]thiazolo[3,2-a]pyridin-4-ium bromides (91–99% yields), while allyl ethers gave 2-substituted derivatives of 2,3-dihydro[1,3]thiazolo[3,2-a]pyridin-4-ium (90–98% yields). Tricyclic condensed
摘要 吡啶-2-亚磺酰溴与乙烯基和烯丙基醚的环化反应区域选择性地进行,但区域化学相反。与乙烯基醚反应生成 3-organyloxy-2,3-dihydro[1,3]thiazolo[3,2 - a ]pyridin-4-ium bromides(91-99% 产率),而烯丙基醚生成 2-取代衍生物2,3-二氢[1,3]噻唑并[3,2 - a ]吡啶-4-鎓(90-98% 产率)。三环缩合化合物通过吡啶-2-亚磺酰溴与环状醚(2,3-二氢呋喃、3,4-二氢-2 H-吡喃和2,5-二氢呋喃)反应合成。