Asymmetric Transfer Hydrogenation of Heterobicyclic Alkenes with Water as Hydrogen Source
作者:Guoli Shen、Jingchao Chen、Dandan Xu、Xia Zhang、Yongyun Zhou、Baomin Fan
DOI:10.1021/acs.orglett.9b00059
日期:2019.3.1
The asymmetric transfer hydrogenation of heterobicyclic alkenes was accomplished by using water as the sole hydrogensource. The transformation was co-catalyzed by Pd(OAc)2/Zn(OTf)2 dual catalyst with metallic zinc as reducing agent. Various azabenzonorbornadienes and oxabenzonorbornadienes were transformed to the corresponding chiral 1,2-dihydronaphthalenes by the asymmetric reductive ring-opening
Iridium-Catalyzed Asymmetric Addition of Thiophenols to Oxabenzonorbornadienes
作者:Sifeng Li、Zhiwu Lu、Ling Meng、Jun Wang
DOI:10.1021/acs.orglett.6b02592
日期:2016.10.21
A highly efficient asymmetric ring addition reaction of oxabenzonorbornadienes with thiophenols using an iridium/(S)-xyl-binap catalyst is developed. This catalyst system overcomes catalyst poisoning and background reactions and allows the formation of exclusive thiol addition products in high yields (up to 97% yield) with excellent enantioselectivities (up to 98% ee). Particularly noteworthy is that
Three-Component Cycloaddition To Synthesize Aziridines and 1,2,3-Triazolines
作者:Shuqi Chen、Yongqi Yao、Wen Yang、Qifu Lin、Lin Wang、Huanyong Li、Donghan Chen、Yun Tan、Dingqiao Yang
DOI:10.1021/acs.joc.9b01713
日期:2019.9.20
An efficient three-component cycloaddition of oxa(aza)bicyclic alkenes/norbornene in the presence of NaN3 and arylsulfonyl chlorides was developed, affording the corresponding aziridine products in good yields (up to 82%) with moderate to good endo/exo selectivities (up to >99:1 endo/exo). Further studies showed that the cycloaddition of oxa(aza)bicyclic alkenes in the presence of NaN3 and chloroalkanes
Directing-Group-Controlled Ring-Opening Addition and Hydroarylation of Oxa/azabenzonorbornadienes with Arenes via C–H Activation
作者:Keyang Zhang、Ruhima Khan、Jingchao Chen、Xuexin Zhang、Yang Gao、Yongyun Zhou、Kangkui Li、Youxian Tian、Baomin Fan
DOI:10.1021/acs.orglett.0c00765
日期:2020.5.1
rhodium-catalyzed additionreaction of oxa/azabicylic alkenes with aromatic ketones and benzoic acids has been developed. The ketones and benzoic acids afforded different addition products when reacted with oxa/azabicyclic alkenes. The reaction between ketones and azabenzonorbornadienes furnished the ring-opening addition products. The reaction between benzoic acids and aza/oxabicyclic alkenes proceeded in
Palladium-Catalyzed <i>syn</i>-Stereocontrolled Ring Opening of Oxabicyclic Alkenes with Arylsulfonyl Hydrazides
作者:Donghan Chen、Yongqi Yao、Wen Yang、Qifu Lin、Huanyong Li、Lin Wang、Shuqi Chen、Yun Tan、Dingqiao Yang
DOI:10.1021/acs.joc.9b01957
日期:2019.10.4
A novel palladium-catalyzed ring-opening reaction of oxabicyclic alkenes with arylsulfonylhydrazides was first developed. In this work, we provide an efficient one-pot reaction to afford the corresponding cis-2-aryl-1,2-dihydronaphthalen-1-ols and 2-aryl-naphthalenes in moderate to excellent yields (up to 95%) under an open-air condition. Various types of functional groups attached to the substrates