Curvularin. Part VI. The preparation of some acylated dimethoxyphenylacetic acids and related compounds
作者:O. C. Musgrave、Richard Templeton、H. D. Munro
DOI:10.1039/j39680000250
日期:——
The substituted octanoic acids HO2C·[CH2]5·CHY·Me(Y = Br, OH, OAc, and OMe) are prepared from 7-oxo-octanoic acid. The acylation of methyl 3,4-dimethoxyphenylacetate with hexanoic acid (using polyphosphoric acid) or with octanoyl chloride (using aluminium chloride or silver perchlorate) gives the expected methyl 2-acyl-4,5-dimethoxyphenylacetates. Similar acylation reactions employing the substituted
取代辛酸HO 2 C·[CH 2 ] 5·CHY·Me(Y = Br,OH,OAc和OMe)由7-氧代辛酸制备。用己酸(使用多磷酸)或辛酰氯(使用氯化铝或高氯酸银)将3,4-二甲氧基苯基乙酸甲酯酰化,得到预期的2-酰基-4,5-二甲氧基苯基乙酸甲酯。使用取代的辛酸(或相应的酰氯)的相似的酰化反应是成功的,并且仅当酰基为7-氧-,7-羟基或7-乙酰氧基-辛酰基时,才产生相似的2-酰基衍生物。4,5-二甲氧基-2-(7-氧代-辛酰基)苯乙酸甲酯的加氢反应生成1-(6-羟基庚基)-6,7-二甲氧基异色喃-3-酮,而在空气中用乙醇碱处理则得到2-羟基-6,7-二甲氧基-3-(5-氧己基)-1,4-萘醌。甲基3 5-二甲氧基苯基乙酸酯与辛酰氯和氯化铝反应,得到3,5-二甲氧基-2-辛酰基苯基乙酸,但是在上述条件下与取代的辛酸(或其酰氯)的反应未能得到酰化产物。但是,三氟乙酸酐中的7-羟基辛酸确实会发