A novel phosphine‐catalyzed δ‐addition reaction between allenoates and isatin derivatives has been developed. In this reaction, γ‐substituted allenoates were used as a novel C₁ synthon to produce oxindole derivatives in good yields and highly diastereoselectivities. Based on the previous mechanistic studies, a proposed phosphine‐catalyzed δ‐addition reaction has been outlined.

中文翻译：

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含Isatin衍生物的γ取代的烯酸的膦催化δ加成反应

已经开发出一种新的膦酸酯催化的烯丙酸酯和伊斯汀衍生物之间的δ加成反应。在该反应中，将γ-取代的烯丙酸酯用作新型的C ₁合成子，以高收率和高非对映选择性生产羟吲哚衍生物。在以前的机理研究的基础上，概述了拟议的膦催化的δ加成反应。