Studies on the Diastereoselective Intramolecular Pauson-Khand Reaction on Regioisomeric Chiral Perhydrobenzoxazines Derived from (-)-8-Aminomenthol
作者:Alicia Maestro、Rafael Pedrosa、Alfonso Pérez-Encabo、Juan J. Pérez-Rueda
DOI:10.1002/ejoc.201101462
日期:2012.2
Chiral perhydrobenzoxazines derived from (–)-8-aminomenthol and containing a 1,6-enyne moiety participate in intramolecular diastereoselective Pauson–Khand reactions with diastereoselection that depends on the nature of the starting compounds. 3-Propargyl-2-vinyl-substituted perhydrobenzoxazines yielded the cyclization products with low diastereoselectivity except for compounds where the double bond
衍生自 (-)-8-氨基薄荷醇并含有 1,6-烯炔部分的手性全氢苯并恶嗪参与分子内非对映选择性 Pauson-Khand 反应,非对映选择取决于起始化合物的性质。3-炔丙基-2-乙烯基取代的全氢苯并恶嗪产生具有低非对映选择性的环化产物,但双键为 1,2-二取代的化合物除外。在 C-2 处具有炔键且在氮原子处具有烯丙基取代基的区域异构全氢苯并恶嗪提供了更好的立体化学区分。