Gold-Catalyzed Tandem Cycloisomerization/Cope Rearrangement: An Efficient Access to the Hydroazulenic Motif
作者:Ziping Cao、Fabien Gagosz
DOI:10.1002/anie.201304497
日期:2013.8.19
Simply complex: The title reaction proceeds at a low loading of catalyst (1 mol %) and allows an efficient and stereoselective access to the hydroazulenicmotif, which is found in numerous natural products having significant biological activities. Tf=trifluoromethanesulfonyl, XPhos=2‐dicyclohexylphosphino‐2′,4′,6′‐triisopropylbiphenyl.
cross-coupling reaction of (Z)-1-(trimethylsilyl)alk-1-enyldicyclohexylborane with (trimethylsilyl)ethynyl bromide proceeds in the presence of a small amount of copper(I) iodide and aqueous sodium hydroxide under extremely mild conditions to afford (Z)-l,3-bis(trimethylsilyl)alk-3-en-l-yne with high regio- and stereoselectivity. In addition, treatment of the resulting product with sodiummethoxide (1 M) leads
(E)- 和 (Z)-alk-1-enyl-dialkylborane 与 (三甲基甲硅烷基) 乙炔基溴的交叉偶联反应在催化量的乙酰丙酮铜 (II) 和碱的存在下在极其温和的条件下进行提供具有末端碳-碳三键的共轭烯炔。使用甲醇钠 (1 M) 作为碱不仅可以产生交叉偶联,而且还可以进行脱甲硅烷化,从而得到 (E)- 和 (Z)-alk-3-en-1-ynes,而氢氧化锂一水合物则同时得到 (E)-和 (Z)-alk-3-en-1-ynes。 E)- 和 (Z)-1-(trimethylsilyl)alk-3-en-1-ynes 具有高区域和立体选择性。另一方面,(Z)-1-(三甲基甲硅烷基)烷-1-烯基二环己基硼烷与(三甲基甲硅烷基)乙炔基溴的交叉偶联反应在少量碘化铜(I)和氢氧化钠水溶液的存在下在极其温和的条件下进行,得到(Z)-l,3-bis(trimethylsilyl)alk-3-e
Construction of Terminal Conjugated Enynes: Regio- and Stereoselective Syntheses of 3-Alken-1-ynes and 1-Trimethylsilyl-3-alken-1-ynes from Alkenyldialkylboranes and (Trimethylsilyl)ethynyl Bromide
作者:Masayuki Hoshi、Kazuya Shirakawa
DOI:10.1055/s-2002-32604
日期:——
The cross-coupling reaction of (E)- and (Z)-1-alkenyl-dialkylboranes with (trimethylsilyl)ethynyl bromide proceeds in the presence of a base and a catalytic amount of Cu(acac) 2 under very mild conditions to provide conjugated enynes whose carbon-carbon triple bond is in distal position. The use of 1 M NaOMe as a base exclusively affords both (E)- and (Z)-3-alken-1-ynes with high regio- and stereoselectivity
(E)- 和 (Z)-1- 烯基-二烷基硼烷与(三甲基甲硅烷基)乙炔基溴的交叉偶联反应在碱和催化量的 Cu(acac) 2 存在下在非常温和的条件下进行,以提供共轭碳碳三键位于远端的烯炔。使用 1 M NaOMe 作为碱专门提供 (E)- 和 (Z)-3-alken-1-ynes 具有高区域和立体选择性,而使用 LiOHH 2 O 代替 1 M NaOMe 优先提供两者(E)- 和 (Z)-1-trimethylsilyl-3-alken-1-ynes 区域和立体选择性。
Stereospecific palladium-catalyzed coupling reactions of vinyl iodides with acetylenic tin reagents
作者:J. K. Stille、James H. Simpson
DOI:10.1021/ja00241a035
日期:1987.4
FEDULOV V. P.; NASYROV I. M., PERSPEKTIVY RASSHIRENIYA ASSORTIMENTA XIM. REAKTIVOV DLYA OBESPECH. POTRE+