Rhodium(II)-Catalyzed Carbocyclization Reaction of α-Diazo Carbonyls with Tethered Unsaturation
作者:Albert Padwa、M. David Weingarten
DOI:10.1021/jo991938h
日期:2000.6.1
cycloalkenone carbenoid. The cyclized carbenoid was found to undergo both aromatic and aliphatic C-H insertion as well as cyclopropanation across a tethered pi-bond. Subjection of diazo phenyl acetic acid 3-phenylprop-2-ynyl ester to Rh(II) catalysis furnished 8-phenyl-1, 8-dihydro-2-oxacyclopenta[a]indenone in high yield. The formation of this compound involves cyclization of the initially formed carbenoid
Fused Benzo[b]fluorenols: Palladium-Catalyzed Intramolecular Dehydroaromatization and Carbonyl Reduction
作者:Quansheng Zhao、Qiong Hu、Lei Wen、Min Wu、Yimin Hu
DOI:10.1002/adsc.201200108
日期:2012.8.13
Benzo[b]fluorenols were prepared by a new palladium-catalyzed one-pot reaction of en-one-ynes with 3-bromoprop-1-yne through intramoleculardehydroaromatization and carbonylreduction.
苯并[ b ]芴醇是通过一种新的钯催化的一键式炔与3-溴丙-1-炔的一锅法通过分子内脱氢芳构化和羰基还原反应制得的。
Intramolecular [4 + 2] Cycloaddition Reactions of Diarylacetylenes: Synthesis of Benzo[<i>b</i>]fluorene Derivatives via Cyclic Allenes
intramolecular [4 + 2] cycloaddition to give benzo[b]fluorene derivatives in good yields. The hybridization of the tether connecting the reacting alkynes has a pronounced effect on the course of the reaction. Theoretical calculations and isotopic labeling studies support a mechanism which involves the generation of a cyclic allene intermediate that evolves to the final benzo[b]fluorene.