Facilesyntheses of di- and triaza crown ethers by in tramolecular cyclization of oligoethylene glycols containing two or three imino groups or by their intermolecular cyclization with oligoethylene glycol bis(p-toluenesulfonate)s are described.
Convenient syntheses, based on cyclohexene oxide, of ligands that are highly preorganised for metal ion size-based selectivity
作者:Alvaro S. de Sousa、Robert D. Hancock
DOI:10.1039/c39950000415
日期:——
Cyclohexene oxide reacts with strong diastereoselectivity with polyamines to give good yields of well defined. crystalline products where only one, or sometimes two, pendant groups are present, such as N-(2-hydroxycyclohexyl)cyclen or DL-1,7-bis(2-hydroxycyclohexyl)-1,4,7-triazaheptane, which as ligands show strong and predictable preferences for smaller metal ions.
A MACROPOLYCYCLE WITH TWO CYCLOHEXANE RINGS FUSED TO A 1,4-DIAZA-7-OXA-CYCLONONANE CORE
作者:Geoffrey A. Lawrance、Marcel Maeder、Mark J. Robertson
DOI:10.1515/hc.2003.9.1.19
日期:2003.1
cyclohexene oxide produces the diaminodioi 1,2-bis(2'hydroxycyclohexylamino)ethane. This undergoes an Okahara ring closure to produce a new diaazaoxa macrocycle 2,5-diaza-12-oxa[12.4.0'.0]tricycloseptadecane, consisting of three fused rings with a core cyclononane unit containing an N 2 0 heteroatom donor set. The relatively rigid saturated molecule was characterized spectroscopically, and molecular mechanics