1 research outputs found
Chiral 2 + 3 Keto-Enamine Pseudocyclophanes Derived from 1,3,5-Triformylphloroglucinol
The reactions of
1,3,5-triformylphloroglucinol with
(1<i>R</i>,2<i>R</i>)-1,2-diaminocyclohexane,
(1<i>R</i>,2<i>R</i>)-1,2-diphenylethylenediamine,
or (<i>R</i>)-2,2′-diamino-1,1′-binaphthyl
result in the formation of enantiopure [2 + 3] keto-enamine condensation
products, in contrast to analogous reactions of 1,3,5-triformylbenzene,
where [4 + 6] Schiff base cages are formed. The X-ray crystal structure
of the diaminocyclohexane 2 + 3 derivative as well as modeled
structures of other compounds of this type show cyclophane-like molecules
with close contact between the phloroglucinol rings. Density Functional
Theory (DFT) calculations confirm that there is a sizable π–π
interaction between these rings influencing the conformation of these
molecules