Asymmetric Reductive and Alkynylative Heck Bicyclization of Enynes to Access Conformationally Restricted Aza[3.1.0]bicycles
作者:Xiaolei Huang、Minh Hieu Nguyen、Maoping Pu、Luoqiang Zhang、Yonggui Robin Chi、Yun‐Dong Wu、Jianrong Steve Zhou
DOI:10.1002/anie.202000859
日期:2020.6.26
Conformationallyrestricted azabicycles are becoming increasingly important in medicinal research. Asymmetric Heck bicyclization of enynes proceeds to give medicinally useful aza[3.1.0] and aza[4.1.0] bicycles with excellent enantioselectivity. The key organopalladium species after bicyclization can be trapped by silanes and terminal alkynes.
Intramolecular Pauson-Khand Reaction of Various 2-Aryl-1,6-Enynes: Synthesis of Bicyclic Compounds Bearing Quaternary Carbon Center
作者:Miyuki Ishizaki、Hiroshi Satoh、Osamu Hoshino
DOI:10.1246/cl.2002.1040
日期:2002.10
Intramolecular Pauson-Khand reaction of various 2-aryl-1-hepten-6-ynes and its aza-derivative (acyclic exo-methylene compounds) efficiently produced 1-aryl-bicyclo[3.3.0] octenones and azaoctenone bearing quaternary carboncenter in good yields. The reaction of 1,7-enynes was also investigated.
Desymmetrization of Diolefinic Diols by Enantioselective Amino‐thiocarbamate‐Catalyzed Bromoetherification: Synthesis of Chiral Spirocycles
作者:Daniel Weiliang Tay、Gulice Y. C. Leung、Ying‐Yeung Yeung
DOI:10.1002/anie.201310136
日期:2014.5.12
A facile, efficient, and highly diastereo‐ and enantioselectivebromoetherification of diolefinicdiols has been developed using an amino‐thiocarbamate catalyst. Further manipulations of the bromoether products enabled entry into a new class of spirocycles which are distinctively lacking in the literature.
The intramolecular Pauson-Khand reaction of various 2-aryl-1-hepten-6-ynes and its aza-derivatives (exo-olefins) efficiently produced arylbicyclo[3.3.0]octenones and azaoctenone bearing quaternary carbon centers at angular positions in good yields. Although a similar reaction of 2-phenyl-1-octen-7-yne (exo-olefin), which is a homologue of 2-phenyl-1-hepten-6-yne, did not take place, the reaction of the methyl derivatives smoothly proceeded. However, the reaction of regioisomeric 1-phenyl-1-octen-7-yne (endo-olefin) afforded the desired product in moderate yields.