Synthesis of Methyl-substituted 1-Cyclopentene-1-carboxylates and Related Compounds
作者:Akira Takeda、K\={o}ichi Shinhama、Sadao Tsuboi
DOI:10.1246/bcsj.50.1831
日期:1977.7
The treatment of methyl-substituted 1-chloro-2-oxo-1-cyclohexanecarboxylic esters (7a–e) with anhydrous Na2CO3 in refluxing xylene gave the corresponding methyl-substituted 1-cyclopentene-1-carboxylic esters (1a–e). Several intermediates important in the synthesis of natural products, such as 4,4-dimethyl-1-cyclopentene-1-carbaldehyde (9), 5-methyl-1-cyclopentene-1-carbaldehyde (12), α-(3-methyl-1
在回流的二甲苯中用无水 Na2CO3 处理甲基取代的 1-氯-2-氧代-1-环己烷羧酸酯(7a-e)得到相应的甲基取代的 1-环戊烯-1-羧酸酯(1a-e)。天然产物合成中的几种重要中间体,如 4,4-二甲基-1-环戊烯-1-甲醛 (9)、5-甲基-1-环戊烯-1-甲醛 (12)、α-(3-甲基-1-环戊烯基)丙酸(16)和2-甲基-3-氧代-1-环戊烯-1-羧酸乙酯(17)已分别从酯1e、1d、1b和1a开始制备。