Bicyclic Sultams with a Nitrogen at the Bridgehead and a Sulfur Atom in the Apex Position: Facile Preparation and Conformational Properties
作者:Valentin A. Rassadin、Daria S. Grosheva、Aleksandr A. Tomashevskiy、Viktor V. Sokolov、Dmitry S. Yufit、Sergei I. Kozhushkov、Armin de Meijere
DOI:10.1002/ejoc.201000345
日期:——
A practical synthesis of bicyclic sultams with a pyramidal bridgehead nitrogen atom and a sulfur atom in the apex position has been elaborated. Compounds with 1-azathiabicyclo[2.2.1]heptane (12a), -bicyclo[3.2.1]octane (12b, 12d), and -bicyclo[3.3.1]nonane (13b) skeletons were obtained by direct twofold inter/intramolecular alkylation of corresponding monocyclic sultams 9 and 10 with α,ω-dihalides
已经详细阐述了具有金字塔形桥头氮原子和在顶点位置的硫原子的双环 sultam 的实际合成。具有 1-氮杂双环 [2.2.1] 庚烷 (12a)、-双环 [3.2.1] 辛烷 (12b, 12d) 和 -双环 [3.3.1] 壬烷 (13b) 骨架的化合物通过直接双分子间/分子内在 K 2 CO 3 /DMF 中用 α,ω-二卤化物 11 烷基化相应的单环 sultam 9 和 10,产率分别为 56、68、52 和 52%。另一方面,1-氮杂-9-硫双环[4.2.1]壬烷衍生物(12c)只能通过逐步二烷基化制备,总产率为24%。讨论了四种新制备的双环 sultam 在溶液和固态中的结构和构象特性。