Copper-Catalyzed Enantioselective Formal Hydroamination of Oxa- and Azabicyclic Alkenes with Hydrosilanes and Hydroxylamines
摘要:
A CuCl/(R,R)-Ph-BPE-catalyzed enantioselective formal hydroamination of oxa- and azabicyclic alkenes with polymethylhydrosiloxane (PMHS) and O-benzoylhydroxylamines has been developed. The efficient and stereoselective net addition of hydrogen and nitrogen atoms provides the corresponding optically active oxa- and azanorbornenyl- and -norbomanylamines in good yields and good enantiomeric ratios.
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
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
Nickel-catalyzed <i>syn</i>-stereocontrolled ring-opening of oxa- and azabicyclic alkenes with dialkylzinc reagents
作者:Yingying Deng、Wen Yang、Yongqi Yao、Xin Yang、Xiongjun Zuo、Dingqiao Yang
DOI:10.1039/c8ob02864h
日期:——
A new nickel-catalyzed syn-stereocontrolled ring-opening of oxa- and azabicyclicalkenes with dialkylzinc reagents was developed, which afforded the corresponding cis-2-alkyl-1,2-dihydronaphthalen-1-ols and 1,2-alkyl amide derivatives in moderate to excellent yields (up to 99% yield) under mild conditions. In this work, we successfully avoided obtaining hydride addition byproducts arising from β-hydride
Copper-Catalyzed Cycloaddition of Heterobicyclic Alkenes with Diaryl Disulfides to Synthesize Dihydrobenzo[b]thiophene Derivatives
作者:Qifu Lin、Wen Yang、Yongqi Yao、Yue Li、Lin Wang、Dingqiao Yang
DOI:10.1021/acs.joc.0c03034
日期:2021.3.5
developed. The C—S and C—C bonds can be formed simultaneously on the C═Cbond of the olefins via a single-step cycloaddition to afford a series of 2,3-dihydrobenzo[b]thiophene derivatives. This reaction exhibits excellent diastereoselectivity and relatively broad substrate scope. Various functional groups attached to the substrates are tolerated in this protocol to give the corresponding exo adducts in moderate
Copper-catalyzed diastereoselective hydrothioetherification of oxa(aza)benzonorbornadienes
作者:Qifu Lin、Yongqi Yao、Wen Yang、Yun Tan、Shuqi Chen、Donghan Chen、Dingqiao Yang
DOI:10.1039/d0ob00659a
日期:——
A novel copper-catalyzed hydrothioetherification of oxa(aza)bicyclic alkenes with potassium thioacetate and aryl or alkyl iodides to synthesize unsymmetrical thioethers has been developed. Notably, the reaction with complete diastereoselectivity went through a syn-selective addition process to give exo-adducts. In addition, this protocol exhibited high efficiency and good functional group tolerance