Probing Host-Selective Phytotoxicity: Synthesis and Biological Activity of Phomalide, Isophomalide, and Dihydrophomalide
作者:Dale E. Ward、Alfredo Vázquez、M. Soledade C. Pedras
DOI:10.1021/jo982376p
日期:1999.3.1
anoic acid] is the host-selective phytotoxin produced by the fungus [Leptosphaeria maculans (Desm.) Ces. et de Not., asexual stage Phoma lingam (Tode ex Fr.) Desm.] which causes blackleg disease (a devastating disease of several economically important brassica crops). Efficient total syntheses of phomalide, its (Z)-isomer isophomalide, and the two dihydro analogues [(R)-dihydrophomalide and (S)-dihydrophomalide]
环状二肽肽苹果酸[cyclo(Val-(E)-Aba-Hpp-Hmp-(R)-Leu);Aba = 2-氨基-2-丁烯酸,Hpp =(2S)-2-羟基-3-苯基丙酸,Hmp =(2S)-2-羟基-4-甲基戊酸]是由宿主产生的宿主选择性植物毒素真菌[Leptosphaeria maculans(Desm。)Ces。等人,无性阶段Phoma lingam(Tode ex Fr.)Desm。]引起黑腿病(几种经济上重要的芸苔属作物的毁灭性疾病)。描述了高效的磷丙二烯,其(Z)-异构体异麦芽酮酯和两种二氢类似物[(R)-二氢苹果酸和(S)-二氢苹果酸]的合成。Cbz-Val-(Z)-Aba与Hpp-Hmp-D-Leu-OBn的[2 + 3]片段偶联,然后去保护和环化,得到异麦考麦德,通过共轭添加PhSeH,然后消除对映体,将其非对映异构体异构化为磷酰亚胺。相应的亚硒酸盐。类似地使用Cbz-Val-