Reactions of macrocyclic rhodium carbenoids: regioselective synthesis of indol-3-yl macrocyclic lactones and cryptands
摘要:
A wide variety of new macrocyclic diazocarbonyl compounds with various spacers was synthesized. Macrocyclic rhodium(H) carberioid insertion with various substituted indoles was performed to afford regioselectively, indol-3-yl macrocyclic di- or tetralactones (C3-alkylation). Double carberioid insertion was also performed to afford indolyl cryptand molecules. (C) 2007 Elsevier Ltd. All rights reserved.
interest are the macrocyclic bismalonates, as they show pronounced crystallisability and arrange into columnar motifs in the solid state. They feature distinctive dihedral angles: all ester moieties adopt anti conformations whereas the planes of the carboxy moieties of each malonate residue arrange in an approximately orthogonal fashion. The latter geometry is enforced by the macrocyclic structures, as
Catalysis with inorganic cations. VIII. Macrocyclic-yliden malonates: Synthesis, spectroscopic investigation, and metal perchlorate catalysis of the Diels-Alder reaction
Macrocyclic-yliden malonates 8–10 have been prepared by Knoevenagel condensation of differently sized crown malonates 5–7 with several aldehydes. The spectroscopic investigations of derivatives 8–10a in several solvents (acetone, acetonitrile, and dichloromethane) in the presence of sodium, lithium, barium, and magnesium perchlorate, evidenced, in some cases, the formation of different complexes, whose
Selective Syntheses of Novel Polyether Fullerene Multiple Adducts
作者:Zhiguo Zhou、David I. Schuster、Stephen R. Wilson
DOI:10.1021/jo034542l
日期:2003.10.1
We have applied a modified macrocyclic tether approach to control multiple additions to C-60. The technique of He-3 NMR was used to confirm the selective formation of specific C-60 multiple adducts by the macrocyclic tether approach. An oligoglycol was used as a flexible linker to produce macrocyclic polyether-linked malonates 5, 6, 8, and 9 under solid-liquid PTC (phase-transfer-catalysis) conditions. The formation of a single C60 tris-adduct, 3, from macrocyclic malonate 1 and (HeC60)-He-3-C-@ was proven by He-3 NMR. Similarly, multiple additions to C-60 of macrocyclic polyether malonate 5 gave C-60 bis-adduct 10 selectively, while the reaction of C-60 with macrocyclic malonate 8 gave bis-adducts 11 and 12. A similar process with macrocyclic malonate 6 gave tris-adduct 13 with high selectivity as well. Saponification of these C-60 multiple adducts gives the corresponding polyacids that are potentially useful in biological applications. Macrocyclic polyether fullerenes are a new class of ionophores, which could be interesting for molecular recognition and for the development of biosensors.
A wide variety of new macrocyclic diazocarbonyl compounds with various spacers was synthesized. Macrocyclic rhodium(H) carberioid insertion with various substituted indoles was performed to afford regioselectively, indol-3-yl macrocyclic di- or tetralactones (C3-alkylation). Double carberioid insertion was also performed to afford indolyl cryptand molecules. (C) 2007 Elsevier Ltd. All rights reserved.