The first [2.2]cyclophane with free N–H in the bridge
作者:Dirk Müller、Martin Nieger、Fritz Vögtle
DOI:10.1039/c39940001361
日期:——
The synthesis, absolute configuration, chiroptical properties and hydrogen bonding of the helical-chiral title compound 1 are reported, which is the first strained [2.2]phane that has an unsubstituted nitrogen in the bridge; an X-ray structure analysis shows 1 to crystallise spontaneously enantiomerically pure, and the presence of the sulfure atom allowed the determination of the absolute configuration
series of helical-chiral 1-thia-10-aza[2.2]metacyclophanes 2–11 with different substituents at the nitrogen atom and at the aromatic ring have been synthesised and their chiroptical properties examined. These new N-substituted phanes are more suitable for the investigation of structure-chiroptics relationships than the already characterised N-tosylated aza[2.2]phanes. Their absolute configuration can be