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Paper | Regular issue | Vol 24, No. 7, 1986, pp.1925-1930
Published online, 1st January, 1970
DOI: 10.3987/R-1986-07-1925
Cinnamoylation of Chromans: Formation of Flavonoids and Neoflavonoids

Raghava Venkataramanna Suresh, Chandrasekharapuram Subramonyam Rukmani Iyer, and Parameswaran Ramasubramonia Iyer*

*Department of Chemistry, Indian Institute of Technology, Powai, Bombay 400 076, India

Abstract

Cinnamoylation of chroman 1 with acid 4 in presence of fused zinc chloride and phosphorus oxychloride gave chalcone 8 and with acids 5-7, the chalcones 9-11 and dihydrocoumarins 15-17 respectively. A similar reaction of chroman 2 with acids 4 and 5 afforded the chalcones 12 and 13 and dihydrocoumarins 18 and 19 while chroman 3 reacted with acid 4 to yield the chalcone 14 and flavanone 20.