Syntheses and reactions of the diethyl α-alkynylmalonates involving the generation of conjugated allenyl esters as the latent active species: A new approach to the development of cysteine proteinase inhibitors
作者:Yoshimitsu Nagao、Kweon Kim、Shigeki Sano、Hisao Kakegawa、Woo Song Lee、Hisashi Shimizu、Motoo Shiro、Nobuhiko Katunuma
DOI:10.1016/0040-4039(95)02284-8
日期:1996.2
Various diethylα-alkynylmalonates (DAM) having potential as cysteineproteinaseinhibitors were synthesized by treatment of diethyl acetyliminomalonate (or ketomalonate) with several lithium acetylides. Hydrolytic decarboxylation of the DAM under the mild basic conditions afforded oxazole derivatives or allenylesters which caused the Michael type reaction with EtSH.
Expeditious Syntheses of Conjugated Allenyl Esters and Oxazoles through a Cascade Reaction of .ALPHA.-Alkynyl Malonates under Alkaline Conditions
作者:Shigeki Sano、Hisashi Shimizu、Kweon Kim、Woo Song Lee、Motoo Shiro、Yoshimitsu Nagao
DOI:10.1248/cpb.54.196
日期:——
Diethyl α-alkynyl-α-methoxymalonates (2a—e) were smoothly hydrolyzed and then decarboxylated under alkaline conditions employing 1 N KOH in EtOH to give conjugated allenyl esters (6a—e) in high yields, and similar alkaline treatment of diethyl α-alkynyl-α-acetylaminomalonates (5a, b, d, e) furnished unexpectedly the oxazoles (7a, b, d, e) having three substituent groups in excellent yields.
α-炔基-α-甲氧基丙二酸二乙酯 (2a-e) 在碱性条件下使用 1 N KOH 的 EtOH 溶液顺利水解,然后脱羧,以高产率得到共轭丙二烯基酯 (6a-e),并且对α-炔基-α-乙酰氨基丙二酸二乙酯(5a、b、d、e)进行类似的碱处理,意外地以优异的产率提供了具有三个取代基的恶唑(7a、b、d、e)。