P[(S,S,S)-CH3NCH(CH2Ph)CH2]3N: a new C3-symmetric enantiomerically pure proazaphosphatrane
摘要:
A new approach for the synthesis of C-3-symmetric proazaphosphatranes with chirality at the bridging methylene positions is reported. (C) 2004 Elsevier Ltd. All rights reserved.
Remote Control of Helical Chirality: Thermodynamic Resolution of a Racemic Mixture of CTV Units by Remote Stereogenic Centers
摘要:
Enantiopure hemicryptophanes designed from the cyclotriveratrylene (CTV) unit display remarkable properties in selective host-guest recognition or as supramolecular catalysts. The unprecedented control of the helical chirality of the CTV unit by remote stereogenic centers of a tren moiety is reported, providing an original access to this highly promising class of host molecules. Although the chiral centers and the CTV unit are separated by more than 10 angstrom, one single diastereomer is formed; the nature of the diastereoselective process is discussed and the procedure is exemplified using different enantiopure tren derivatives. This work also highlights the influence of the chirality of the CTV unit on the whole cage structure.