Two Distinct Gold-Catalyzed Oxidative Annulations of 1,5-Allenynes with Nitrones to Yield 1-Naphthol Derivatives Bearing 2,3- versus 3,4-Fused Nitroxy Rings
Molybdenum-mediated cyclocarbonylation of 1-ethynyl-2-allenylbenzenes to 1H-cyclopenta[a]inden-2-ones
作者:Swarup Datta、Rai-Shung Liu
DOI:10.1016/j.tetlet.2005.09.068
日期:2005.11
Although 1-ethynyl-2-allenylbenzenes readily undergo Myers-Saito or Schmittel cyclization under mild conditions, cyclocarbonylation of these moieties to 1H-cyclopenta[a]inden-2-ones proceeds smoothly using suitable molybdenum carbonyl reagents, with Mo(CO)(3)(CH3CN)(3) being the most efficient. The yields of desired bicyclic ketones were up to 87-93%. (c) 2005 Elsevier Ltd. All rights reserved.
Nitrosoarenes Implement Cascade Cyclization of 1-Allenyl-2-alkynylbenzenes through Diradical Mechanism
作者:Chandrima Maitra、Prakash D. Jadhav、Debashis Barik、Yeu-Shiuan Ho、Chu-Chun Cheng、Mu-Jeng Cheng、Yun-Wei Chiang、Rai-Shung Liu