摘要:
1-Unsubstituted isoselenochromenes (3) were converted into the 2-benzoselenopyrylium salts (4) by treatment with Ph3C+BF4- and the reaction of the salts (4) with several nucleophilic reagents (alcohol, amine, cyanide, acetone, and Grignard reagents) afforded the corresponding 1-functionalized isoselenochromenes (5-9) in high yields, respectively. 1-Alkyl- and 1-phenyl-2-benzoselenopyrylium salts (10) were also obtained from 9.