Rhodium-Catalyzed Intramolecular [3+2+2] Cycloadditions between Alkylidenecyclopropanes, Alkynes, and Alkenes
作者:Marisel Araya、Moisés Gulías、Israel Fernández、Gaurav Bhargava、Luis Castedo、José Luis Mascareñas、Fernando López
DOI:10.1002/chem.201402473
日期:2014.8.11
A Rh‐catalyzed intramolecular [3+2+2] cycloaddition is reported. The cycloaddition affords synthetically relevant 5,7,5‐fused tricyclic systems of type 2 from readily available dienyne precursors. The transformation takes place with moderate or good yields, high diastereoselectivity, and total chemoselectivity.
Palladium-catalyzed [3C + 2C + 2C] cycloaddition of enynylidenecyclopropanes: efficient construction of fused 5-7-5 tricyclic systems
作者:Gaurav Bhargava、Beatriz Trillo、Marisel Araya、Fernando López、Luis Castedo、José L. Mascareñas
DOI:10.1039/b919258a
日期:——
We report a Pd-catalyzed intramolecular [3C + 2C + 2C] cycloaddition between alkylidenecyclopropanes, alkynes and alkenes. The method provides synthetically relevant 5-7-5 tricyclic structures, with good chemoselectivity and complete diastereoselectivity.
Highly Enantioselective Cobalt‐Catalyzed (3+2) Cycloadditions of Alkynylidenecyclopropanes
作者:Eduardo Da Concepción、Israel Fernández、José L. Mascareñas、Fernando López
DOI:10.1002/anie.202015202
日期:2021.4.6
Low‐valent cobalt complexes equipped with chiral ligands can efficiently promote highly enantioselective (3+2) cycloadditions of alkyne‐tethered alkylidenecyclopropanes. The annulation allows to assemble bicyclic systems containing five‐membered rings in good yields and with excellent enantiomeric ratios. We also present a mechanistic discussion based on experimental and computational data, which support
配备手性配体的低价钴络合物可以有效地促进炔烃系链的亚烷基环丙烷的高对映选择性(3 + 2)环加成反应。该环状结构可以以高收率和出色的对映体比率组装包含五元环的双环系统。我们还提出了基于实验和计算数据的机制讨论,这些讨论支持Co I / Co III催化循环的参与。