Rhodium(II)-Catalyzed and Thermally Induced Intramolecular Migration of<i>N</i>-Sulfonyl-1,2,3-triazoles: New Approaches to 1,2-Dihydroisoquinolines and 1-Indanones
作者:Run Sun、Yu Jiang、Xiang-Ying Tang、Min Shi
DOI:10.1002/chem.201504914
日期:2016.4.11
New rhodium(II)‐catalyzed or thermally induced intramolecular alkoxy group migration of N‐sulfonyl‐1,2,3‐triazoles has been developed, affording divergent synthesis of 1,2‐dihydroisoquinoline and 1‐indanone derivatives according to different conditions. N‐Sulfonyl keteneimine is the key intermediate for the synthesis of dihydroisoquinoline, whereas the aza‐vinyl carbene intermediate results in the
Palladium-Catalyzed Chemoselective Aminomethylative Cyclization and Aromatizing Allylic Amination: Access to Functionalized Naphthalenes
作者:Bangkui Yu、Houjian Yu、Hanmin Huang
DOI:10.1021/acs.orglett.0c03365
日期:2020.11.20
A palladium-catalyzedchemoselective aminomethylative cyclization and aromatizing allylic amination of enyne-tethered allylic alcohols with aminals is described. Under the reaction conditions, the cationic vinyl allylpalladium species undergoes selective migratory insertion of alkenes rather than reductive elimination with nucleophiles. This strategy provides an efficient and unique approach to the
Stereoselective Synthesis of Oxabicyclo[2.2.1]heptenes via a Tandem Dirhodium(II)-Catalyzed Triazole Denitrogenation and [3 + 2] Cycloaddition
作者:Hao Yuan、Jianxian Gong、Zhen Yang
DOI:10.1021/acs.orglett.6b02703
日期:2016.11.4
A novel synthetic strategy for the diastereoselective synthesis of structurally diverse oxabicyclo[2.2.1]heptenes has been developed, featuring a tandemreaction combining a Rh-catalyzed triazole denitrogenation and a novel type of [3 + 2] cycloadditionreaction. This tandemreaction was thought to proceed via a five-membered oxonium ylide intermediate, which was formed by the intramolecular nucleophilic
Enynes connected through aromatic rings are used as substrates for metathesis reactions. The reactivity of three ruthenium carbene complexes is compared. The resulting 1,3-dienes are suitable precursors of polycyclic structures via a Diels−Alder process. Some domino RCM-Diels−Alder reactions are performed, suggesting a possible beneficial effect of the ruthenium catalyst in the cycloaddition process