A Cascade Process of Hydroxamates Renders 1,6-Dioxa-3,9-diazaspiro[4.4]nonane-2,8-diones
作者:Zohreh Nazarian、Craig M. Forsyth
DOI:10.1055/s-0040-1706660
日期:2021.6
A cascade route to 1,6-dioxa-3,9-diazaspiro[4.4]nonane-2,8-diones from N,O-diacyl hydroxylamines consisting of a two-step procedure is described. The key transformation is a [3,3]-sigmatropic rearrangement of N,O-diacyl hydroxylamines promoted by formation of a silylketenaminal followed by an intramolecular cyclization and a final spirocyclization. The optimum reaction conditions employ a one-fold
描述了由N,O-二酰基羟胺到1,6-二氧杂3,9-二氮杂螺[4.4]壬烷-2,8-二酮的级联途径,该过程由两步程序组成。关键的转化是通过形成甲硅烷基酮亚胺,随后进行分子内环化和最后的螺环化,促进N,O-二酰基羟胺的[3,3]-σ重排。最佳反应条件使用每种试剂的一倍过量,并用于制备这类化合物的结构上不同的例子。