Photoassisted Synthesis of Enantiopure Alkaloid Mimics Possessing Unprecedented Polyheterocyclic Cores
作者:N.N. Bhuvan Kumar、Olga A. Mukhina、Andrei G. Kutateladze
DOI:10.1021/ja4042109
日期:2013.7.3
high yielding intramolecularcycloadditions of photogeneratedazaxylylenes tethered to pyrroles, with further growth of molecular complexity via post-photochemical transformations of primary photoproducts. This expeditious access to structurally unprecedented polyheterocyclic cores is being developed in the context of diversity-oriented synthesis, as the modular design allows for rapid "pre-assembly"
A ruthenium complex with a monodentate phosphine ligand was used to catalytically hydrogenate N‐protected α‐aminoacids under essential retention of the configuration of their α‐chiral centers. Among the ligands tested for this hydrogenation, which proceeds at a relatively low temperature, tris(para‐fluorophenyl)phosphine exhibited the best performance. In comparison, electron‐rich monodentate, bidentate
具有单齿膦配体的钌配合物用于在N-保护的α-手性中心基本保留的条件下催化氢化N-保护的α-氨基酸。在进行这种氢化测试的配体中(在相对较低的温度下进行),三(对-氟苯基)膦表现出最好的性能。相比之下,富电子的单齿,双齿和三齿膦的效果要差得多。预催化剂Ru(OAc)2 [(p -FC 6 H 4)3 P] 2合成并分离,并通过单晶X射线衍射分析确定其结构。具有中性烷基侧链的N保护的α-氨基酸,包括硫化物,吲哚,醚,酚,吡咯和芳烃等极性官能团,与所应用的氢化条件兼容,从而提供了相应的旋光2取代2 (1 H-吡咯-1-基)乙-1-醇(2-氨基乙醇)衍生物,中等至高收率。