Acid-catalyzed isomerization of 3-indolyl sulfides to 2-indolyl sulfides: first synthesis of 3-unsubstituted 2-arylthioindoles. Evidence for a complex intermolecular process
摘要:
The acid-catalyzed isomerization of 3-indolyl sulfides 1 to the corresponding 2-indolyl sulfides 4 provides the first synthesis of 3-unsubstituted 2-(arylthio)indoles, a hitherto unattainable class of compounds. When catalyzed by trifluoroacetic acid, the isomerization proceeds mainly via an intermolecular mechanism involving initial disproportionation to a 2,3-indolyl bis-sulfide 5 and an unsubstituted counterpart 6 followed by further interaction of these species to yield the rearranged isomer 4. A mechanism is proposed involving a role for the acid in the sulfenyl-transfer steps. This type of process also occurs, to a lesser extent, in the polyphosphoric acid catalyzed isomerization.
Nagarajan, K.; Arya, V. P.; Parthasarathy, T. N., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 8, p. 672 - 679
作者:Nagarajan, K.、Arya, V. P.、Parthasarathy, T. N.、Shenoy, S. J.、Shah, R. K.、Kulkarni, Y. S.
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作者:G. G. Levkovskaya、E. V. Rudyakova、A. N. Mirskova
DOI:10.1023/a:1022566202511
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A method was developed for preparation of (3-indolylsulfanyl)alkanecarboxylic acids from 1H-, 1-methyl(benzyl)-, 2-methylindoles, thiourea, iodine, and halocarboxylic acids.
NAGARAJAN, K.;ARYA, V. P.;PARTHASARATHY, T. N.;SHENOY, S. J.;SHAH, R. K.;+, INDIAN J. CHEM., 1981, 20, N 8, 672-679
作者:NAGARAJAN, K.、ARYA, V. P.、PARTHASARATHY, T. N.、SHENOY, S. J.、SHAH, R. K.、+