1.
J Org Chem
; 71(3): 1240-3, 2006 Feb 03.
Artigo
em Inglês
| MEDLINE
| ID: mdl-16438545
RESUMO
Three new covalently linked molecular capsules were synthesized from their resorcinarene cavitand precursors in good yields. The capsules undergo reversible conformational switching between the closed "vase" form and the open "kite" form upon temperature or pH variation. The kite conformation obtained via either method in CDCl(3) switches to vase conformation upon addition of polar solvents such as acetone-d(6) or THF-d(8).
Assuntos
Fenilalanina/análogos & derivados , Calixarenos , Cápsulas/química , Concentração de Íons de Hidrogênio , Espectroscopia de Ressonância Magnética , Conformação Molecular , Fenilalanina/síntese química , Fenilalanina/química , Solventes , Temperatura
2.
Org Lett
; 6(3): 333-6, 2004 Feb 05.
Artigo
em Inglês
| MEDLINE
| ID: mdl-14748586
RESUMO
[structure: see text] Selective excision of one or two quinoxaline units from tetraquinoxaline cavitand using catechol and base in DMF yields tri- and diquinoxaline cavitands in yields of up to 71%.