Tandem Ruthenium-Catalyzed Transfer-Hydrogenative Cyclization/Intramolecular Diels–Alder Reaction of Enediynes Affording Dihydrocoumarin-Fused Polycycles
作者:Yoshihiko Yamamoto、Kazuma Matsui、Masatoshi Shibuya
DOI:10.1021/ol500548x
日期:2014.3.21
A tandem transfer-hydrogenative cyclization/intramolecular Diels–Alder reaction of enediyne substrates, containing 1,6-diyne, acrylate dienophile, and phenol tether moieties, was successfully accomplished using the combination of a cationic ruthenium complex, [CpRu(AN)3]PF6 (1b, Cp = η5-C5H5, AN = MeCN), as the catalyst and a Hantzsch ester as the H2 surrogate to afford interesting dihydrocoumarin-fused
阳离子钌络合物[CpRu(AN)3 ]的组合成功地完成了包含1,6-二炔,丙烯酸二亲和物和苯酚系链部分的烯二炔底物的串联转移-氢化环化/分子内Diels-Alder反应。PF 6(图1b中,Cp =η 5 -C 5 H ^ 5,AN = MeCN中),作为催化剂和汉奇酯作为H 2替代,得到有趣二氢香豆素-稠合多环的产品作为单一非对映体。