Novel Multichiral Diols and Diamines by Highly Stereoselective Pinacol Coupling of Planar Chiral [2.2]Paracyclophane Derivatives
作者:Elena V. Sergeeva、Valeria I. Rozenberg、Dmitrii Yu. Antonov、Evgenii V. Vorontsov、Zoya A. Starikova、Ivan V. Fedyanin、Henning Hopf
DOI:10.1002/chem.200500413
日期:2005.11.18
coupling of the planar chiral carbonyl compounds [2.2]paracyclophane-4-carbaldehyde, 4-acetyl[2.2]paracyclophane (ketone) and the four regioisomeric 5-, 7-, 12- and 13-methoxy[2.2]paracyclophane-4-carbaldehydes as well as the pTosOH-Zn/Cu-promoted coupling of their N-substituted imines is described. Coupling of the enantiomerically pure substrates (most of carbonyl compounds and all imines) occurs stereoselectively
TiCl4 / Zn介导的平面手性羰基化合物[2.2]对环phan-4-甲醛,4-乙酰基[2.2]对环phan(酮)和四个区域异构的5-,7-,12-和13-甲氧基的分子间频哪醇偶联描述了[2.2]对环庚烷-4-甲醛以及它们的N-取代的亚胺的pTosOH-Zn / Cu促进的偶联。对映体纯的底物(大多数羰基化合物和所有亚胺)的偶联发生立体选择,从而产生非对映体纯的1,2-二醇和1,2-二胺。外消旋醛和酮以不同程度的立体选择性(取决于某些位置的取代基)反应,生成一到三个非对映异构体。7-甲氧基[2.2]对环庚烷-4-甲醛经串联频哪醇偶联-频哪醇重排产生双-(7-甲氧基[2.]。2]对环烷-4-基)乙醛。外消旋亚胺的偶合在每种情况下产生单一外消旋D,L-二胺和单一内消旋二胺的混合物。不对称中心的立体选择性形成是由平面手性[2.2]对环庚基部分控制的。阐述的技术扩展到[2.2]对环-4,13-二