Enantioselective Gold(I)-Catalyzed Intramolecular (4+3) Cycloadditions of Allenedienes
作者:Isaac Alonso、Hélio Faustino、Fernando López、José L. Mascareñas
DOI:10.1002/anie.201105815
日期:2011.11.25
Allene‐tethered dienes (1) undergo an intramolecular and highly enantioselective (4+3) cycloaddition when treated with suitable chiral phosphoramidite/gold(I) catalysts (see scheme; Ar=9‐anthracenyl). The reactions provide synthetically relevant [5.3.0] and [5.4.0] fused bicyclic systems 2 with good yields, complete diastereocontrol, and excellent enantioselectivities.
当用合适的手性亚磷酰胺/金(I)催化剂处理时,异戊二烯系二烯(1)会经历分子内高对映选择性(4 + 3)环加成反应(见方案; Ar = 9-蒽基)。反应提供了合成上相关的[5.3.0]和[5.4.0]稠合双环系统2,具有良好的产率,完全的非对映异构控制和优异的对映选择性。