α′-position with the ω-chain aldehydes followed by dehydration to produce the title compounds. In a similar manner, 5-dehydro compounds (acetylene analogues) were synthesized successfully. In addition, palladium-catalyzed reaction of 4-cyclopentene-1,3-diol monoacetate with methyl malonate, the first step of the synthesis, was improved to afford the product in high yield by using t-BuOK or LDA in place
具有α链的关键
环戊烯酮,从4-
环戊烯-1,3
-二醇单
乙酸酯的TBS醚合成,并且在提交给醛醇缩合反应的α '位上与ω-链醛,然后
脱水,产生标题化合物。以类似的方式,成功地合成了5-
脱氢化合物(
乙炔类似物)。另外,通过使用t- BuOK或
LDA代替NaH ,改进了合成的第一步
钯-催化的4-
环戊烯-1,3
-二醇单
乙酸酯与
丙二酸甲
酯的反应,从而以高收率提供了产物。