N-heterocyclic carbene (NHC) ligands were used in palladium catalysis to bring about a highly enantioselective C(sp(3))-H activation on the methylene site of a cycloalkane moiety. The intramolecular coupling reaction of a prochiral N-aryl-N-cycloalkyl methyl carbamate required high temperatures (140-160 degrees C) and afforded highly enantioenriched trans-2,3-fused indolines.
新的位阻手性N-杂环卡宾(NHC)
配体用于
钯催化,以在环
烷烃部分的亚
甲基位点上实现高度对映选择性的C(sp(3))-H活化。前手性N-芳基-N-
环烷基
氨基甲酸甲酯的分子内偶联反应需要高温(140-160℃),并提供高度对映体富集的反式2,3-稠合的二
氢吲哚。