Stereoselective synthesis of optically active dihydrofurans and dihydropyrans via a ring closing metathesis reaction
作者:Merve Çayir、Sema Demirci、Serdar Sezer、Cihangir Tanyeli
DOI:10.1016/j.tetasy.2011.07.003
日期:2011.6
derivatives, respectively, with chemical yields which varied between 72% and 88%. On the other hand, enantiomerically enriched enynes derived from homoallyl and homopropargyl alcohols gave the corresponding optically active dihydropyrans with conjugated diene units with chemical yields between 70% and 80%. A subsequent Diels–Alder reaction of the dihydropyran derivatives with a diene unit with tetracyanoethylene
描述了二烯的闭环复分解反应和衍生自烯丙基,高烯丙基和高炔丙醇主链的闭环烯炔复分解反应。2-杂芳基取代的烯丙基,高烯丙基和高炔丙基醇可通过高ee(93-99%)的酶促拆分和已知的立体化学方法轻松有效地拆分。衍生自烯丙醇和高烯丙基醇的对映体富集的二烯分别提供相应的对映体富集的二氢呋喃和二氢吡喃衍生物,化学收率在72%至88%之间变化。另一方面,衍生自高烯丙基和高炔丙基醇的对映异构体富集的炔烃得到具有共轭二烯单元的相应的旋光性二氢吡喃,其化学收率在70%至80%之间。