Synthesis of Diynes and Tetraynes from in Situ Desilylation/Dimerization of Acetylenes
摘要:
[GRAPHICS]An efficient method for the in situ desillylation/oxidative dimerization of (trialkylsilyl)acetylenes is described. This protocol avoids the complications encountered with sensitive diynes by eliminating the deprotection and isolation steps. Various aromatic and alkyl diynes and tetraynes can be synthesized in a straightforward manner in good yields (82-99%) from TIPS-protected acetylenes. This method facilitates the efficient synthesis of novel tetrayne-bridged acetylenic cyclophanes 6 and 7 in a direct manner.
Gold-Catalyzed Cadiot-Chodkiewicz-type Cross-Coupling of Terminal Alkynes with Alkynyl Hypervalent Iodine Reagents: Highly Selective Synthesis of Unsymmetrical 1,3-Diynes
作者:Xiangdong Li、Xin Xie、Ning Sun、Yuanhong Liu
DOI:10.1002/anie.201702833
日期:2017.6.6
A new and efficient method for the synthesis of unsymmetrical 1,3‐butadiynes by gold‐catalyzed C(sp)–C(sp) cross‐coupling of terminal alkynes with alkynyl hypervalent iodine(III) reagents has been developed. The reaction features high selectivity and efficiency, mild reaction conditions, wide substrate scope, and functional‐group compatibility, and is a highly attractive complement to existing methods
Palladium-Catalyzed Dimerization of Conjugated Diynes: Synthesis of (<i>E</i>)-1,2-Divinyldiethynylethenes Having Donor and Acceptor Chromophores at the Terminus of Alkyne
作者:Nirmal K. Pahadi、Draxel H. Camacho、Itaru Nakamura、Yoshinori Yamamoto
DOI:10.1021/jo052262v
日期:2006.2.1
es (DVDEEs) having donor and acceptor chromophores at the terminals of alkyne unit 7‘ were synthesized by the palladium/HOAc-catalyzed dimerization of the conjugated diynes 8 bearing an Si group at the terminus of alkyne (R1 position), followed by desilylation and subsequent Sonogashira reaction of the resulting terminal alkyne 10 with aryl iodides.
(E)-1,2-二乙烯基二乙炔基(DVDEEs)在炔烃单元7 '的末端具有供体和受体发色团,是通过钯/ HOAc催化的在炔烃末端带有Si基团的共轭二炔8的二聚共轭二炔8的二聚作用合成的( R 1位置),然后进行甲硅烷基化和随后的最终炔烃10与芳基碘化物的Sonogashira反应。
Synthesis of Diynes and Tetraynes from in Situ Desilylation/Dimerization of Acetylenes
作者:Matthew A. Heuft、Shawn K. Collins、Glenn P. A. Yap、Alex G. Fallis
DOI:10.1021/ol016414u
日期:2001.9.1
[GRAPHICS]An efficient method for the in situ desillylation/oxidative dimerization of (trialkylsilyl)acetylenes is described. This protocol avoids the complications encountered with sensitive diynes by eliminating the deprotection and isolation steps. Various aromatic and alkyl diynes and tetraynes can be synthesized in a straightforward manner in good yields (82-99%) from TIPS-protected acetylenes. This method facilitates the efficient synthesis of novel tetrayne-bridged acetylenic cyclophanes 6 and 7 in a direct manner.