Efficient synthesis of functionalised ten-membered lactones via acid-catalysed intramolecular reactions of 5-(tetrahydro 2-furyl)pentanoic trifluoroacetic anhydride
作者:David H. Grayson、Edwin D. Roycroft
DOI:10.1039/c39930000269
日期:——
5-(Tetrahydro-2-furyl)pentanoic trifluoroacetic anhydride reacts in the presence of trifluoroacetic acid to yield 6-trifluoroacetoxy-9-nonanolide together with (E)-non-5-en-9-olide; treatment of the same mixed anhydride with titanium(IV) chloride gives 6-chloro-9-nonanolide, and its reaction with trifluoroacetic acid in the presence of sodium iodide leads to 6-iodo-9-nonanolide.
5-(四氢-2-呋喃基)戊酸三氟乙酸酐在三氟乙酸存在下发生反应,生成 6-三氟乙酰氧基-9-壬醇内酯和 (E)-壬-5-烯-9-醇内酯;将相同的混合酸酐与氯化钛(IV)处理,可生成 6-氯-9-壬醇内酯,其与三氟乙酸在碘化钠存在下发生反应,可生成 6-碘-9-壬醇内酯。