Synthesis of Thioalkynes by Desilylative Sonogashira Cross‐Coupling of Aryl Iodides and 1‐Methylthio‐2‐(trimethylsilyl)ethyne
European Journal of Organic Chemistry(2022)
摘要
1‐Methylthio‐2‐arylethynes were prepared in typically good to excellent yields from aryl iodides and 1‐methylthio‐2‐(trimethylsilyl)ethyne by a desilylative Sonogashira process employing Pd(PPh3)2Cl2 (1 mol %), CuI (10 mol %), and K2CO3 (6 eq) in MeOH‐Et3N‐THF (1 : 2 : 2) at rt for 16 h (16 examples, 31–96 % yield). Thienyl and pyridyl iodides (all regioisomers) were similarly converted to 1‐methylthio‐2‐heteroarylethynes (5 examples, 54–82 % yield). The process was extended with similar results to comparable thioalkynes substituted on sulfur by n‐alkyl, s‐alkyl, and aryl groups.
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关键词
Alkynes,Cross-coupling,Desilylation,Thioethers,Transition-metal catalysis
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