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New Greener Alternative for Biocondensation of Aldehydes and Indoles Using Lemon Juice: Formation of Bis-, Tris-, and Tetraindoles

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Author(s): Rammohan Pal

Journal: International Journal of Organic Chemistry
ISSN 2161-4687

Volume: 03;
Issue: 02;
Start page: 136;
Date: 2013;
Original page

Keywords: Citrus limon Juice | Biocondensation | Aldehydes | Indoles | Aqueous Ethanol | Sonication | Bis- | Tris- | Tetraindoles

ABSTRACT
This work presents a new greener alternative for biocondensation of aldehydes and indoles for the synthesis of bis- and tris(indolyl)methanes catalyzed by lemon juice (Citrus limon) in good yields under ultrasound irradiation in aqueous ethanol. Various substituted aldehydes with indoles under this reaction condition are elucidated. Also, tetraindolyl compounds were prepared using terephthaldialdehyde by following the same protocol. This method is an environmentally benign, efficient reaction, which requires shorter reaction time and simple experimental and work-up procedures.
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