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Molecules 2010, 15(4), 2491-2498; doi:10.3390/molecules15042491
Article

New 3H-Indole Synthesis by Fischer’s Method. Part I.

1,2,* , 1
,
1
 and
1
1 Department of Chemistry, Payame Noor University (PNU), P O Box 91735-433, Mashhad, Iran 2 Department of Chemistry, Payame Noor University (PNU), Ilam, Iran
* Author to whom correspondence should be addressed.
Received: 6 February 2010 / Revised: 12 March 2010 / Accepted: 19 March 2010 / Published: 8 April 2010
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Abstract

Methyl indolenines (4a-c) and(5a-c) were prepared in high yield by a Fischer indole synthesis reaction of o,m-tolylhydrazine hydrochlorides (1a-b) with isopropyl methyl ketone (2) and 2-methylcyclohexanone (3) in acetic acid at room temperature. o,p- Nitrophenylhydrazines (1c-d) were reacted with 2-methylcyclohexanone (3) in acetic acid at reflux to give nitroindolenines (5d-e), while the attempted reactions of o,p-nitrohydrazines with isopropyl methyl ketone (2) in acetic acid were not successful. Compounds(1c-d) were reacted with isopropyl methyl ketone (2) in acetic acid/HCl to give 2,3,3-trimethyl-5-nitro-indolenine (4e) and 2,3,3-trimethyl-7-nitroindolenine (4d).
Keywords: 3H-indole; indolenine; Fischer’s synthesis method; acetic acid 3H-indole; indolenine; Fischer’s synthesis method; acetic acid
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sajjadifar, S.; Vahedi, H.; Massoudi, A.; Louie, O. New 3H-Indole Synthesis by Fischer’s Method. Part I.. Molecules 2010, 15, 2491-2498.

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