[2 + 3] cycloaddition reactions of fluorinated alkynes with 2-formylphenylboronic acids under the influence of Co(acac)₂·2H₂O in two-component solvents of acetonitrile/2-propanol at reflux temperature for 18 h took place smoothly, affording the corresponding fluoroalkylated indenol derivatives in good yields. This reaction shows excellent regioselectivity, giving 2-fluoroalkylated indenols, together with a very small amount of 3-fluoroalkylated indanones as side products.

中文翻译：

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区域选择性的钴（II）催化的氟烷基化炔烃与2-甲酰基苯基硼酸的[2 + 3]环加成反应：易于获得2-氟烷基化的茚基。

Co（acac）₂ ·2H ₂ O在乙腈/ 2-丙醇双组分溶剂中回流下，氟化炔烃与2-甲酰基苯基硼酸的[2 + 3]环加成反应顺利进行18 h，得到相应的氟代烷基化的茚满醇衍生物，收率很高。该反应显示出优异的区域选择性，得到2-氟烷基化的茚基，以及非常少量的3-氟烷基化的茚满酮作为副产物。