Tautomerism and Stereodynamics of Indophenols, Amidines, and Their Derivatives and Analogs: XVI. Synthesis of Tetrahydroquinoxalines Having Spiro-Fused Oxoindole and Cyclohepta[c]furan Fragments
摘要:
Alkylation of o-(N-sulfonylamino)phenylimino derivatives of indol-2-one and cyclohepta[c]furan with phenacyl bromides is accompanied by cyclization to previously unknown tetrahydroquinoxalines having spiro-fused oxoindole and cyclohepta[c]furan fragments. The structure of the latter includes a nitrogen-oxygen triangular system typical of most natural cytotoxic compounds.
Tautomerism and Stereodynamics of Indophenols, Amidines, and Their Derivatives and Analogs: XVI. Synthesis of Tetrahydroquinoxalines Having Spiro-Fused Oxoindole and Cyclohepta[c]furan Fragments
摘要:
Alkylation of o-(N-sulfonylamino)phenylimino derivatives of indol-2-one and cyclohepta[c]furan with phenacyl bromides is accompanied by cyclization to previously unknown tetrahydroquinoxalines having spiro-fused oxoindole and cyclohepta[c]furan fragments. The structure of the latter includes a nitrogen-oxygen triangular system typical of most natural cytotoxic compounds.
Intramolecular π-complexes based on nitroaryl derivatives of furotroponimine: structure and stereodynamics
作者:V. I. Minkin、A. V. Tkachuk、M. E. Kletskii、D. V. Steglenko、V. A. Voronina、S. V. Kurbatov
DOI:10.1007/s11172-013-0065-6
日期:2013.2
Neutral aromatic electrophiles, such as trinitrobenzene and dinitrobenzofuroxane, covalently bound to the furotroponimine moiety form intramolecular through-space charge-transfer π-complexes both in solution and in the crystalline state. The kinetic and activation parameters of stereodynamic processes were determined by dynamic NMR spectroscopy. These parameters provide quantitative estimates of the kinetic stability of the p-complexes. The electronic and geometric characteristics of the π-complexes were calculated by the B3LYP/6-31G** method.
中性芳香族亲电子试剂,例如三硝基苯和二硝基苯并呋喃,与呋托苯胺部分共价结合,在溶液和结晶状态下形成分子内通过空间电荷转移π-配合物。立体动力学过程的动力学和活化参数通过动态核磁共振波谱测定。这些参数提供了 p 配合物动力学稳定性的定量估计。 π配合物的电子和几何特征通过B3LYP/6-31G**方法计算。
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作者:V. I. Simakov、S. V. Kurbatov、O. Ya. Borbulevych、M. Yu. Antipin、L. P. Olekhnovich
DOI:10.1023/a:1011333722238
日期:——
Condensation of ortho-aminophenols and N-benzylsulfonyl-o-phenylenediamine with nin-hydrin afforded tetracyclic products, the amino group entering into condensation with the carbonyl group at position 1 of ninhydrin. The structures of the reaction products were established by H-1 NMR spectroscopy and X-ray diffraction analysis.
Tautomerism and Stereodynamics of Indophenols, Amidines, and Their Derivatives and Analogs: XVI. Synthesis of Tetrahydroquinoxalines Having Spiro-Fused Oxoindole and Cyclohepta[c]furan Fragments
作者:S. V. Kurbatov、D. N. Kuznetsov、V. I. Simakov、V. A. Voronina、Yu. A. Zhdanov、L. P. Olekhnovich
DOI:10.1023/b:rugc.0000039087.49416.5e
日期:2004.5
Alkylation of o-(N-sulfonylamino)phenylimino derivatives of indol-2-one and cyclohepta[c]furan with phenacyl bromides is accompanied by cyclization to previously unknown tetrahydroquinoxalines having spiro-fused oxoindole and cyclohepta[c]furan fragments. The structure of the latter includes a nitrogen-oxygen triangular system typical of most natural cytotoxic compounds.