Synthesis and chemical transformation of fused tetrazoles derived from 2-bromomethyl- and 2-iodomethyl-3,5,6,7-tetrahydro-4(2<i>H</i>)-benzofuranones
作者:Malose J. Mphahlele、Thwanthwadi B. Moekwa
DOI:10.1002/jhet.5570430414
日期:2006.7
The 2-bromomethyl-3,5,6,7-tetrahydrobenzofuranones 1a-d were subjected to triazidochlorosilanesodium azide-mediated Schmidt rearrangement to afford the corresponding tetrazolofuroazepine derivatives 2a-d via methylene shift. Under similar reaction conditions, the 2-iodomethyl-3,5,6,7-tetrahydrobenzofuranones 1e-h afford mixtures of the corresponding tetrazolofuroazepines 2e-h and the 4-azido-2-iodomethyl-2
对2-溴甲基-3,5,6,7-四氢苯并呋喃酮1a-d进行三叠氮基氯硅烷叠氮化钠介导的Schmidt重排,以通过亚甲基转移得到相应的四唑呋喃并pine庚因衍生物2a-d 。在相似的反应条件下,2-碘甲基-3,5,6,7-四氢苯并呋喃酮1e-h提供相应的四唑呋喃并氮杂2 2e-h和4-azido-2-碘甲基-2,3-二氢苯并呋喃衍生物3a-c的混合物。提出了一种机制来解释这些2-卤代甲基四氢苯并呋喃酮的反应性的差异(X = Br对I)。反过来,2-卤代甲基四唑并呋喃西pine 2a,b,dh然后将4-叠氮基-2-碘甲基-2-,3-二氢苯并呋喃3a,b用亚磷酸三乙酯进行亲核取代,并用DBU在回流的甲苯中进行脱氢卤化反应,得到相应的四唑并呋喃品氮烷4a-d和5a-c以及苯并呋喃6a,b。