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■ 1-Allylation of 2-Benzotelluropyrylium Salts and 2-Benzoselenopyrylium Salts by Means of Allyltin Reagents

Kazuo Ohyanagi and Haruki Sashida*

*Faculty of Pharmaceutical Sciences, Hokuriku University, 3-Ho, Kanagawa machi, Kanazawa 920-1181, Japan

Abstract

3-tert-Butyl-2-benzotelluropyrylium salt (1) reacts with an equal amount of allyltributyltin to afford 1-allyl-3-tert-butyl-1H-isotellurochromene (8a) in 93 % yield. Similarly, 1-allyl-1H-isotellurochromenes (9) and isoselenochromenes (10, 11) were prepared from the corresponding pyrylium salts (2-4) in moderate to good yields.