Photochemical behaviour of ω-thiabicyclo[3.n.1]alkan-3-one: a mechanistic and exploratory study
作者:Osamu Muraoka、Bao-Zhong Zheng、Maiko Nishimura、Genzoh Tanabe
DOI:10.1039/p19960002265
日期:——
The photoreactivity of 9-thiabicyclo[3.3.1]nonan-3-one 9 is investigated under a variety of conditions and compared with those of its monocyclic or norbicyclic analogues 1 and 4. The principal reaction of ketone 9 on irradiation in tert-butyl alcohol is the Norrish type I cleavage to yield tert-butyl (cis-6-methyltetrahydrothiopyran-2-yl)acetate 10a, while compounds 1 and 4 give ring-contracted thilactones
在多种条件下研究了9-噻双环[3.3.1] nonan-3-one 9的光反应性,并将其与其单环或正双环类似物1和4进行了比较。酮9在叔丁基中辐射的主要反应醇是Norrish I型裂解,可生成叔丁基(顺式-6-甲基四氢硫代吡喃-2-基)乙酸酯10a,而化合物1和4则可得到环缩合的内酯2和5。讨论了化学选择性不同的原因。在甲醇中直接照射后观察到的酮9的特征光反应性,导致形成内醇末端可以通过假设在光激发态下硫和羰基部分之间的电荷转移相互作用来解释-11。