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.
Cyclization of 2- and 3-indolythioalkanoic acids to novel indole-containing tricyclic ring systems
作者:Pierre Hamel、Mario Girard
DOI:10.1002/jhet.5570330624
日期:1996.11
series of 2- and 3-indolylthioalkanoic acids of various chain lengths were cyclized under dehydrative conditions affording tricyclic indole-containingringsystems wherein the third ring contains a sulfur atom attached to the 2- or 3-position of the indole ring. This methodology affords entry into the novel thiepino[3,2-b]indole, thiocino[2,3-b]indole and thiocino[3,2-b]indole ringsystems.
在脱水条件下将一系列各种链长的2-和3-吲哚基硫代链烷酸环化,得到含三环吲哚的环系统,其中第三个环含有连接到吲哚环的2-或3-位的硫原子。该方法提供了新的噻吩并[3,2- b ]吲哚,噻吩并[2,3- b ]吲哚和噻吩并[3,2- b ]吲哚环系统的入口。
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.
DOI:——
日期:——
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.、+
DOI:——
日期:——
US5030646A
申请人:——
公开号:US5030646A
公开(公告)日:1991-07-09
Acid-catalyzed isomerization of 3-indolyl sulfides to 2-indolyl sulfides: first synthesis of 3-unsubstituted 2-arylthioindoles. Evidence for a complex intermolecular process
作者:Pierre Hamel、Yves Girard、Joseph G. Atkinson
DOI:10.1021/jo00035a029
日期:1992.4
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.