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
Platinum and Ruthenium Chloride-Catalyzed Cycloisomerization of 1-Alkyl-2-ethynylbenzenes: Interception of π-Activated Alkynes with a Benzylic C−H Bond
作者:Mamoru Tobisu、Hiromi Nakai、Naoto Chatani
DOI:10.1021/jo901045g
日期:2009.8.7
Air-stable and commercially available alkynophilic metal salts, such as PtCl2, PtCl4, and [RuCl2(CO)(3)](2), catalyze the cycloisomerization of 1-alkyl-2-ethynylbenzenes to produce Substituted indenes even at all ambient temperature. Electrophilically activated alkynes can be intercepted by simple benzylic C-H bonds at primary, secondary, and tertiary carbon centers. Mechanistic studies, such as labeling studies and kinetic isotope and substituent effects, indicate that the cycloisomerization proceeds through the formation of a vinylidene intermediate and turnover-limiting 1,5-shift of benzylic hydrogen.