Stereochemical studies — 79 synthesis and kinetic study on the retrodiene decomposition of norbornene-condensed 1,3-oxazin-4-ones
作者:Géza Stájer、LászlÓ Mód、Angela E. Szabó、Ferenc Folöp、Gábor Bernáth、Pál Sohár
DOI:10.1016/0040-4020(84)80022-8
日期:1984.1
converted into 2-aryvl-cis-cxo-1,3-oxazin-4-ones 5a-d. These compounds, similarly to the diendo isomers 1a-d studied by us earlier, undergo retrodiene decomposition under mild conditions to give 2-aryl-62-l,3-oxazin-6-ones (2a-d) in 50-60% yield. The ratio of the decomposition rate constants of the tricyclic diendo and diexo-1,3-oxazin-4-ones, measured in toluene solution, is about 2.
具有降冰片烯骨架的顺式-cxo-氨基酸c被转化为2-aryvl-顺式-cxo-1,3-恶嗪-4-酮5a-d。这些化合物与我们之前研究的二烯基异构体1a-d类似,在温和条件下进行逆二烯分解,以50-60%的收率得到2-芳基-62-1,3-恶嗪-6-(2a-d)。 。在甲苯溶液中测得的三环二烯基和二恶英-1,3-恶嗪-4-酮的分解速率常数之比约为2。