see text] A convergent approach for the stereoselective synthesis of 2-alkoxy-3-alkyl(aryl)thiobuta-1,3-dienes has been developed. It was found that Negishi coupling between alpha-alkyl(aryl)thio vinyl zinc chloride and alpha-bromo vinyl ether or Negishi coupling between alpha-bromo vinyl sulfide and alpha-alkoxy vinyl zinc chloride provided the best yield and stereoselectivity.
[反应:见正文]已开发出一种收敛方法,用于2-烷氧基-3-烷基(芳基)
硫代丁1,3-二烯的立体选择性合成。发现α-烷基(芳基)
硫代
乙烯基氯化锌与α-
溴乙烯基醚之间的Negishi偶联或α-
溴乙烯基硫化物与α-烷氧基
乙烯基氯化锌之间的Negishi偶联提供了最佳的收率和立体选择性。