New transition metal-catalyzed methods for the arylation of indolizines by the direct cleavage of CâH bonds have been developed. A wide range of aryltrifluoroborate salts react with indolizines in the presence of Pd(OAc)2 catalyst and AgOAc oxidant to give the arylated indolizines in high yields. Both electron-donating and electron-withdrawing groups perform smoothly while bromide and chlorine substituents are tolerated. In addition, the indolizines display similar reactivities in the Pd-catalyzed reaction with 3-phenylpropiolic acid to afford the corresponding C-3 alkynylated indolizines. These methods allow the direct functionalization of indolizines in one step.
开发了新的过渡
金属催化方法,通过直接断裂C-H键实现
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环己烯的芳基化。一系列芳基三
氟硼酸盐在Pd(OAc)2催化剂和AgOAc氧化剂的存在下与
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环己烯反应,高效地得到芳基化的
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环己烯。供电子和吸电子基团均表现良好,而
溴和
氯取代基也可耐受。此外,
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环己烯在Pd催化反应中与3-苯基
丙炔酸显示出相似的反应活性,从而获得相应的C-3炔基化
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环己烯。这些方法使得
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环己烯能够在一步中直接进行官能团化。