Cooperative Activation with Chiral Nucleophilic Catalysts and<i>N</i>-Haloimides: Enantioselective Iodolactonization of 4-Arylmethyl-4-pentenoic Acids
作者:Hidefumi Nakatsuji、Yasuhiro Sawamura、Akira Sakakura、Kazuaki Ishihara
DOI:10.1002/anie.201400946
日期:2014.7.1
Chiral triaryl phosphates promote the enantioselective iodolactonization of 4‐substituted 4‐pentenoic acids to give the corresponding iodolactones in high yields with high enantioselectivity. N‐Chlorophthalimide (NCP) is employed as a Lewis acidic activator and oxidant of I2 for the present iodolactonization. In combination with 1.5 equivalents of NCP, only 0.5 equivalents of I2 are sufficient to generate
手性磷酸三芳基酯促进4-取代的4-戊烯酸的对映选择性碘内酯化,以高收率和高对映选择性产生相应的碘内酯。N-氯邻苯二甲酰亚胺(NCP)被用作本碘代内酯化的路易斯酸性活化剂和I 2的氧化剂。与1.5当量的NCP结合,仅0.5当量的I 2足以产生碘化试剂。