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.
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.
Exploiting the dual role of ethynylbenziodoxolones in gold-catalyzed C(sp)–C(sp) cross-coupling reactions
作者:Somsuvra Banerjee、Nitin T. Patil
DOI:10.1039/c7cc04283c
日期:——
Reported herein is the gold-catalyzed alkynylation of terminal alkynes using ethynylbenziodoxolones (EBXs), where EBXs serve a dual role as oxidants as well as alkyne transfer agents to access unsymmetrical 1,3-diynes. Hence, the catalytic system requires no externaloxidants and is compatible with a broad range of substrates, including those with polar functional groups such as NH, OH and B(OH)2.