The fully diethoxyphosphoryl(Dep)-protected polyamines 1b-3b were prepared from the corresponding polyamines with 'diethyl phosphite' (= diethyl phosphonate) and CCl4 in a solid base/organic liquid two-phase system in the presence of Bu4NBr as phase-transfer catalyst. Subsequent phase-transfer-catalyzed alkylation of phosphoramidates 1b-3b with bis(chloromethyl)arenes 5-8 in the presence of Bu4N(HSO4) followed by deprotection gave good yields of polyazacyclophanes 9a-16a.
Guest-Induced Selective Functionalization of Polyaza[<i>n</i>]paracyclophanes
作者:M. Isabel Burguete、Beatriu Escuder、Juan C. Frías、Enrique García-España、Santiago V. Luis、Juan F. Miravet
DOI:10.1021/jo971329e
日期:1998.3.1
A new strategy to the preparation of selectively functionalized polyazamacrocycles is presented. Polyaza[n]paracyclophane receptors are able to efficiently direct their own selective functionalization upon interaction with simple guests such as metal cations. This enables the preparation of novel receptors functionalized at one of the benzylic nitrogen atoms with a variety of groups. Selective difunctionalization at both benzylic positions can also be achieved in this way.
Crystalline self-assembly induced by aromatic edge-to-face interactions: the crystal structure of 2,6,6,10-tetrabenzyl-2,10-diaza-6-azonia[11]paracyclophane bromide
作者:M Isabel Burguete、Michael Bolte、Juan C Frı́as、Enrique Garcı́a-España、Santiago V Luis、Juan F Miravet