Unambiguous structure elucidation of the reaction products of 3-acyl-4-methoxy-1-methylquinolinones with hydroxylamine via NMR spectroscopy
作者:Stefano Chimichi、Marco Boccalini、Alessandra Matteucci
DOI:10.1016/j.tet.2007.08.108
日期:2007.11
Reaction of 3-acyl-4-methoxy-1-methylquinolinones 2a,b with hydroxylamine has been investigated under different experimental conditions. Whereas compound 2a gives rise selectively and exclusively to the regioisomeric isoxazolo[4,5-c]- or isoxazolo[4,3-c]quinolin-4(5H)one (compound 3a or 4a, respectively), reaction of 2b always led to a mixture of the required isoxazole together with the oxazole derivative
已经在不同的实验条件下研究了3-酰基-4-甲氧基-1-甲基喹啉酮2a,b与羟胺的反应。尽管化合物2a选择性地和排他性地产生了区域异构的异恶唑并[4,5- c ]-或异恶唑并[4,3- c ]喹啉-4(5 H)酮(分别为化合物3a或4a),但2b总是反应得到所需的异恶唑和恶唑衍生物的混合物。通过多核(13 C和15 N)磁共振波谱可以独立地完成所有产品的结构解析。