Abstract
The cis,trans trispiro ether 4 is accessible from several synthetic directions as a consequence of a crossover in reaction selectivity when proceeding from nucleophilic attack on the cis dispiro ketone to oxygenation of the α,β-unsaturated ester 17. Its cis,cis isomer 3 was obtained in 17 steps and 14.6% overall yield from 3,5-dimethoxybenzoic acid by making use of the alicyclic side chain in N as a "conformational lock". Although 4 shows no measurable tendency to complex with alkali metal ions, 3 binds strongly to Li+ and Na+ ions, as well as to CH3NH3+. Whereas the 3eq conformation is populated in the solid state and in solution, complex formation occurs readily. 13C NMR studies have defined slow exchange limits as the 2:1 sandwich complex with lithium ion is initially formed and transformed progressively into a 1:1 species upon the addition of more LiClO4. Only the 2:1 complex with sodium ion is formed during comparable titration with NaClO4. Association constants, molecular mechanics calculations, and X-ray crystallographic studies provide insight into the binding capacity of this belted tridentate ionophore.
| Original language | English |
|---|---|
| Pages (from-to) | 9160-9171 |
| Number of pages | 12 |
| Journal | Journal of Organic Chemistry |
| Volume | 65 |
| Issue number | 26 |
| DOIs | |
| Publication status | Published - 2000 Dec 29 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
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Preorganized ligand arrays based on spirotetrahydrofuranyl motifs. Synthesis of the steyeoisomeric 1,8,14-trioxatrispiro[4.1.4.1.4.1]octadecanes and the contrasting conformational features and ionic binding capacities of these belted ionophores. / Paquette, L. A.; Tae, J.; Hickey, E. R.; Trego, W. E.; Rogers, R. D.
In: Journal of Organic Chemistry, Vol. 65, No. 26, 29.12.2000, p. 9160-9171.Research output: Contribution to journal › Article
TY - JOUR
T1 - Preorganized ligand arrays based on spirotetrahydrofuranyl motifs. Synthesis of the steyeoisomeric 1,8,14-trioxatrispiro[4.1.4.1.4.1]octadecanes and the contrasting conformational features and ionic binding capacities of these belted ionophores
AU - Paquette, L. A.
AU - Tae, J.
AU - Hickey, E. R.
AU - Trego, W. E.
AU - Rogers, R. D.
PY - 2000/12/29
Y1 - 2000/12/29
N2 - The cis,trans trispiro ether 4 is accessible from several synthetic directions as a consequence of a crossover in reaction selectivity when proceeding from nucleophilic attack on the cis dispiro ketone to oxygenation of the α,β-unsaturated ester 17. Its cis,cis isomer 3 was obtained in 17 steps and 14.6% overall yield from 3,5-dimethoxybenzoic acid by making use of the alicyclic side chain in N as a "conformational lock". Although 4 shows no measurable tendency to complex with alkali metal ions, 3 binds strongly to Li+ and Na+ ions, as well as to CH3NH3+. Whereas the 3eq conformation is populated in the solid state and in solution, complex formation occurs readily. 13C NMR studies have defined slow exchange limits as the 2:1 sandwich complex with lithium ion is initially formed and transformed progressively into a 1:1 species upon the addition of more LiClO4. Only the 2:1 complex with sodium ion is formed during comparable titration with NaClO4. Association constants, molecular mechanics calculations, and X-ray crystallographic studies provide insight into the binding capacity of this belted tridentate ionophore.
AB - The cis,trans trispiro ether 4 is accessible from several synthetic directions as a consequence of a crossover in reaction selectivity when proceeding from nucleophilic attack on the cis dispiro ketone to oxygenation of the α,β-unsaturated ester 17. Its cis,cis isomer 3 was obtained in 17 steps and 14.6% overall yield from 3,5-dimethoxybenzoic acid by making use of the alicyclic side chain in N as a "conformational lock". Although 4 shows no measurable tendency to complex with alkali metal ions, 3 binds strongly to Li+ and Na+ ions, as well as to CH3NH3+. Whereas the 3eq conformation is populated in the solid state and in solution, complex formation occurs readily. 13C NMR studies have defined slow exchange limits as the 2:1 sandwich complex with lithium ion is initially formed and transformed progressively into a 1:1 species upon the addition of more LiClO4. Only the 2:1 complex with sodium ion is formed during comparable titration with NaClO4. Association constants, molecular mechanics calculations, and X-ray crystallographic studies provide insight into the binding capacity of this belted tridentate ionophore.
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U2 - 10.1021/jo001430a
DO - 10.1021/jo001430a
M3 - Article
C2 - 11149865
AN - SCOPUS:0034731576
VL - 65
SP - 9160
EP - 9171
JO - Journal of Organic Chemistry
JF - Journal of Organic Chemistry
SN - 0022-3263
IS - 26
ER -