Synthesis 2007(3): 428-432  
DOI: 10.1055/s-2006-958964
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of 3-Aroylnicotinonitriles from Aroylketene Dithioacetals

E. R. Anabhaa, K. N. Nirmalaa, Abraham Thomasb, C. V. Asokan*a
a School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P. O., Kottayam, Kerala 686 560, India
Fax: +(91)4812731009; e-Mail: asokancv@yahoo.com;
b Glenmark Pharmaceuticals Ltd, TTC Industrial Area, Navi Mumbai, 400 709, Maharashtra, India
Further Information

Publication History

Received 11 July 2006
Publication Date:
21 December 2006 (online)

Abstract

The Knoevenagel adducts of 2-aroyl-3,3-bis(alkylsulfanyl)acrylaldehydes and malononitrile were cyclized in the presence of diisopropylamine to afford 5-aroyl-2,6-bis(methylsulfanyl)nicotinonitriles. Cyclization in the presence of aqueous ammonia gave 2-amino-5-aroyl-6-(methylsulfanyl) nicotinonitriles. A multicomponent reaction involving aroylketene dithioacetals, malononitrile and Vilsmeier reagent gave 5-aroyl-2-chloro-6-(methylsulfanyl)nicotinonitrile.