供体-受体环丙烷与两亲性苯并二硫代次氯亚胺反应生成具有两个硫原子的七元杂环。从形式上讲,这种转变可以看作是三元环和邻双硫代醌的[4 + 3]环加成反应。苯并二硫代次氯亚胺用作该高反应性二烯的替代物。产品结构通过X射线晶体学确认。13 C NMR研究中的宽信号表明,室温下存在几个在NMR时标上缓慢相互转化的构象体。
The Cyclopropyl Group as a Neglected Donor in Donor–Acceptor Cyclopropane Chemistry
作者:Alexander Kreft、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.8b00603
日期:2018.4.6
D-A cyclopropanes bearing a simple cyclopropyl group as donor are shown to undergo a variety of [3+ n]-cycloaddition reactions ( n = 2-4). This behavior contrasts sharply with that of common D-A cyclopropanes with aliphatic donors. Kinetic experiments demonstrate that, in terms of donor ability, the cyclopropyl substituent lies between electron-rich and electron-neutral aryl donors.
Exploiting amphiphilicity: facile metal free access to thianthrenes and related sulphur heterocycles
作者:Martin Pawliczek、Lennart K. B. Garve、Daniel B. Werz
DOI:10.1039/c5cc01757b
日期:——
Readily available benzodithioloimines are reacted with arynes or alkynes substituted with electron-withdrawing groups to afford the corresponding thianthrene or benzo[b][1,4]dithiine derivatives. The transformation takes place under mild reaction conditions without...