铜(I)催化的N-吲哚系环丙烯的分子内串联环化:功能化的氢化二氮杂苯并[ a ]环戊[ cd ] azulene衍生物的合成
摘要:
本文提出了Cu(I)催化的N吲哚系环丙烯的[3 + 2]分子内环加成反应。该反应始于在用Cu(I)催化剂活化环丙烯并进行Friedel-Crafts型环化反应以形成官能化的氢化二氮杂苯并[ a ]环戊[ cd ]之后,形成π-烯丙基阳离子中间体或其共振稳定的金属类化合物中间体。天青石的产量高到极好,dr值中等到良好。可以实现该环加成反应的不对称变体,从而得到具有中等ee值的所需产物。
Gold(I)-Catalyzed Cycloisomerization of Enynes Containing Cyclopropenes
作者:Changkun Li、Yi Zeng、Hang Zhang、Jiajie Feng、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201002673
日期:2010.8.23
Goldenyne: Gold‐catalyzed cycloisomerization reactions of propargyl cyclopropenes afford benzene derivatives in a highly efficient manner. The reaction either proceeds through a mechanism with or without double and triple bond cleavage, depending on the substituents (see scheme).
Divergent gold-catalysed reactions of cyclopropenylmethyl sulfonamides with tethered heteroaromatics
作者:Melanie A. Drew、Sebastian Arndt、Christopher Richardson、Matthias Rudolph、A. Stephen K. Hashmi、Christopher J. T. Hyland
DOI:10.1039/c9cc06241f
日期:——
Cyclopropenylmethyl sulfonamides with tethered heteroaromatics have been demonstrated to undergo divergent gold-catalysed cyclisation reactions. A formal dearomative (4+3) cycloaddition takes place with furan-tethered substrates, yielding densely functionalised 5,7-fused heterocycles related to the bioactive curcusone natural products. Indole-tethered substrates display divergent reactivity giving
Rh(I)-Catalyzed Carbonylative Carbocyclization of Tethered Ene− and Yne−cyclopropenes
作者:Changkun Li、Hang Zhang、Jiajie Feng、Yan Zhang、Jianbo Wang
DOI:10.1021/ol101091r
日期:2010.7.2
Rh(I)-catalyzed carbonylative carbocyclization of ene- and yne-cyclopropene systems provides cyclohexenones and phenols with high efficiency, respectively.
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