Total synthesis and antibacterial screening of ( ± )-7-butyl-6,8-dihydroxy-3-pentyl-3,4-dihydroisochromen-1-one
作者:Aamer Saeed、Hummera Rafique、Muhammad Arshad
DOI:10.1080/10286020.2013.817993
日期:2013.10
A new total synthesis of ( ± )-7-butyl-6,8-dihydroxy-3-pentyl-3,4-dihydroisochromen-1-one, isolated as R-enantiomer from Geotrichum sp., has been described. Reaction of 4-butyl-3,5-dimethoxyhomophthalic anhydride with hexanoyl chloride in the presence of 1,1,3,3-tetramethyl guanidine and triethyl amine afforded 7-butyl-6,8-dimethoxy-3-pentylisochromen-1-one, which was converted into corresponding 3
从Geotrichum sp。分离出作为R-对映异构体的(±)-7-丁基-6,8-二羟基-3-戊基-3,4-二氢异色素n-1-one的新的全合成。在1,1,3,3-四甲基胍和三乙胺的存在下,4-丁基-3,5-二甲氧基高邻苯二甲酸酐与己酰氯反应,得到7-丁基-6,8-二甲氧基-3-戊基异色烯-1-酮通过连续的开环和还原反应,将其转化为相应的3,4-二氢异色素n-1-one。使用无水氯化铝的乙硫醇溶液进行最终的脱甲基,得到天然产物。使用左氧氟沙星作为标准品,对目标化合物和中间体进行针对10个细菌菌株的抗菌评估。