[reaction: see text] Asymmetric reductive ring opening of oxa- and azabenzonorbornadienes with organic acids and zinc powder under mild conditions catalyzed by Ni(binap)Cl(2) or Pd(binap)I(2) produces the corresponding 1,2-dihydronaphth-1-ols in good to excellent yields with high enantioselectivity.
Diastereoselective [3+2] Annulation of Aromatic/Vinylic Amides with Bicyclic Alkenes through Cobalt-Catalyzed C−H Activation and Intramolecular Nucleophilic Addition
dihydroepoxybenzofluorenone derivatives fromaromatic/vinylic amides and bicyclic alkenes is described. This new transformation proceeds through cobalt‐catalyzed C−H activation and intramolecular nucleophilic addition to the amide functional group. Transition‐metal‐catalyzed C−H activation reactions of secondary amides with alkenes usually lead to [4+2] or [4+1] annulation; to the best of our knowledge
Rhodium‐Catalyzed Asymmetric [2+2+2] Cycloaddition Reactions of 1,6‐Enynes and Oxabenzonorbornadienes
作者:Jianxiao Ni、Jingchao Chen、Yongyun Zhou、Gaowei Wang、Sida Li、Zhenxiu He、Weiqing Sun、Baomin Fan
DOI:10.1002/adsc.201900380
日期:2019.8.5
The asymmetric [2+2+2] cycloaddition reactions of 1,6‐enynes and oxabenzonorbornadienes was accomplished by using the complex of [Rh(COD)2]BF4 and (R)‐Xyl‐P‐Phos as chiral catalyst. A range of 1,6‐enynes and oxabenzonorbornadienes were well tolerated in the cycloaddition reaction, which afforded various polycyclic products with asymmetric quaternary carbon centers generally in excellent enantioselectivities
AgOTf-Catalyzed Tandem Reaction of Oxabenzonorbornadienes with Arylacetylenes
作者:Yongyun Zhou、Shanshan Liu、Hualei Chen、Jingchao Chen、Weiqing Sun、Sifeng Li、Qingjing Yang、Baomin Fan
DOI:10.1002/cjoc.201500392
日期:2015.10
A tandem isomerization/hydroarylation reaction of oxabenzonorbornadienes and arylacetylenes was realized by using AgOTf as catalyst. 1,1‐Diarylethylenes could be easily generated as products in moderate to good yields in this tandemreaction.
Ruthenium-Catalyzed Isomerization of Oxa/Azabicyclic Alkenes: an Expedient Route for the Synthesis of 1,2-Naphthalene Oxides and Imines
作者:Karine Villeneuve、William Tam
DOI:10.1021/ja058621l
日期:2006.3.1
1,2-Naphthalene oxides and imines can be rapidly accessed through a ruthenium-catalyzed isomerization of readily available 7-oxa/azabenzonorbornadienes. These mild reaction conditions were found to be tolerant to various functional groups and the isomerization is highly regioselective.