Cycloaddition behavior of 3,4-diazacyclopentadienone dioxides toward bicyclo[2.2.1]heptadiene derivatives. X-ray analysis of the cycloadduct and reaction pathway
作者:Masashi Eto、Kazunobu Harano、Yasuyuki Yoshitake、Takuzo Hisano
DOI:10.1002/jhet.5570300618
日期:1993.12
The cycloaddition behavior of 2,5-disubstituted 3,4-diazacyclopentadienone dioxide 1a-c toward epoxy-naphthalene (2a) and norbornadiene (2b) was investigated. The structures of the products were determined on the basis of the 1H- and 13C-nmr spectral data and the X-ray analysis data. The stereospecific formation of the endo-exo 1,3-dipolar cycloadducts from 2a indicates that the cycloadduct resulted
研究了2,5-二取代的3,4-二氮杂双环戊二烯酮二氧化物1a-c对环氧萘(2a)和降冰片二烯(2b)的环加成行为。根据1 H和13 C-nmr光谱数据和X射线分析数据确定产物的结构。来自2a的内-外1,3-偶极环加合物的立体定向形成表明该环加合物是直接1,3-偶极环加成产生的。在PM3计算的过渡态结构的基础上,讨论了1向2的环加成行为。