Au(I)-Catalyzed Hydrative Rearrangement of 1,1-Diethynylcarbinol Acetates to Functionalized Cyclopentenones and Allenones
作者:Chang Ho Oh、Swastik Karmakar
DOI:10.1021/jo802103g
日期:2009.1.2
5-acetoxy-2-alkyl-2-cyclopentenones (2) and acetoxymethyl α-alkylallenones (3) have been described via Au-catalyzed hydrative rearrangement of 1,1-diethynylcarbinol acetates (1). In anhydrous condition, Au(I)-catalyzed [3,3]-rearrangement of 1 afforded the 3-alkynylallenyl acetate 4 in low yield. Treatment of 1 with Au(I) catalyst in wet CH2Cl2 produced either 2 or 3 as a major product depending on the temperature, reaction
同分异构的5-乙酰氧基-2-烷基-2-环戊烯酮(的原子经济的合成2)和乙酰氧基甲基α-alkylallenones(3)已经经由1,1- diethynylcarbinol乙酸盐的Au催化重排hydrative(被描述1)。在无水条件下,金(I)催化的[3,3]的-rearrangement 1,得到3-乙酸alkynylallenyl 4在低收率。在潮湿的CH 2 Cl 2中用Au(I)催化剂处理1会产生2或3作为主要产物,具体取决于温度,反应时间和催化剂负载量。d已经提出了作为中间体的中间体,其可以通过Au(I)诱导的中间体4的内部氧杂环化作用,然后由水分子进行化学选择性亲核攻击而形成。的形成2或3可能通过进行说明顺序1,3-二氧杂环戊烯开环和金促进的5-内切-挖carbocyclization或中间的简单质子d分别。