Oxa-Pictet–Spengler reaction as key step in the synthesis of novel σ receptor ligands with 2-benzopyran structure
作者:Inga Knappmann、Dirk Schepmann、Bernhard Wünsch
DOI:10.1016/j.bmc.2016.06.046
日期:2016.9
The Oxa-Pictet–Spengler reaction of methyl 3-hydroxy-4-phenylbutanoate (8) was explored to obtain novel σ receptor ligands. 1-Acyl protected piperidone ketals 10 and 11 reacted with phenylethanol 8 to yield spirocyclic compounds. Aliphatic aldehyde acetals 19 provided 1,3-disubstituted 2-benzopyrans 20 with high cis-diastereoselectivity. The intramolecular Oxa-Pictet–Spengler reaction of 24 led to
探索了3-羟基-4-苯基丁酸甲酯的Oxa-Pictet-Spengler反应(8),以获得新的σ受体配体。1-酰基保护的哌啶酮缩酮10和11与苯乙醇8反应生成螺环化合物。脂肪醛缩醛19提供具有高顺式-非对映选择性的1,3-二取代的2-苯并吡喃20。分子内的Oxa-Pictet-Spengler反应24导致三环化合物25。螺环化合物18示出了高σ 1个亲和力(ķ我20-26 1nM)和σ 1/σ 2选择性(> 9倍)中,当一个大的取代基(Ñ辛基,苄基,苯丙基)附着到哌啶Ñ -原子。哌啶环,以产氨乙基(的开口22,23)或氨甲基衍生物(21)导致降低σ 1个亲和力和σ 1 /σ 2的选择性。