Silver-Catalyzed [2+1] Cyclopropenation of Alkynes with Unstable Diazoalkanes:<i>N</i>-Nosylhydrazones as Room-Temperature Decomposable Diazo Surrogates
作者:Zhaohong Liu、Qiangqiang Li、Peiqiu Liao、Xihe Bi
DOI:10.1002/chem.201605335
日期:2017.4.6
The [2+1] cycloaddition of alkynes with diazo compounds represents one of the most powerful and reliable methods for the construction of cyclopropenes. However, it remains a formidable challenge to accomplish the cyclopropenation of alkynes with non‐stabilized diazoalkanes, owing to the fact that such compounds are unstable and prone to detonation. Herein, we report a general silver‐catalyzed cyclopropenation
Mild propargylic oxidation using a diacetoxyiodobenzene/tert-butyl hydroperoxide protocol
作者:Yi Zhao、Angela Wan Ting Ng、Ying-Yeung Yeung
DOI:10.1016/j.tetlet.2014.06.032
日期:2014.7
A mild propargylic oxidation of alkynes is reported using a diacetoxyiodobenzene/tert-butylhydroperoxide (DIB/TBHP) protocol. The reactions proceed smoothly at 0 °C and a number of α,β-unsaturated alkynoic ketones are obtained.
Reactions of diynes RCC-X-CCR with zirconocene ethylene complex Cp2Zr(CH2=CH2) were investigated. When X was C6H4 or C4H2S, bridged zirconacyclopentenes were selectively formed. They were easily converted into bridged cyclopentenone derivatives. In the case of (CH2)n groups as X, the reaction products were strongly dependent on the R group.
研究了二炔类化合物 RCC-X-CCR 与二茂锆乙烯络合物 Cp2Zr(CH2=CH2) 的反应。当 X 为 C6H4 或 C4H2S 时,选择性地形成了桥接的锆环戊烯。它们很容易转化为桥式环戊烯酮衍生物。当 X 为 (CH2)n 基团时,反应产物在很大程度上取决于 R 基团。
Barnes, Craig E.; Orvis, Jeffery A.; Finniss, Gary M., Organometallics, 1990, vol. 9, # 5, p. 1695 - 1697
作者:Barnes, Craig E.、Orvis, Jeffery A.、Finniss, Gary M.
DOI:——
日期:——
NUGENT, W. A.;CALABRESE, J. C., J. AMER. CHEM. SOC., 1984, 106, N 21, 6422-6424