First Total Synthesis of Astechrome: Novel Hydroxamic Acid with an Indole-Pyrazine Skeleton.
作者:Hao JING、Atsuko SHIMADA、Atsushi MAEDA、Yasuyo ARAI、Mikiko GOTO、Yutaka AOYAGI、Akihiro OHTA
DOI:10.1248/cpb.42.277
日期:——
Astechrome (1), isolated from Aspergillus terreus IFO 6123 and 8835, was synthesized. Indolylmagnesium bromide (4) was coupled with a chloromethylpyrazine (5) to give 2-chloro-5-methoxy-3-methyl-6-[7-(3-methyl-2-butenyl)indol-3-yl]methylpyrazine 1-oxide (6), which was converted to the Fe salt (9) of a hydroxamic acid derivative (8). Oxidation of 9 with Co(salen) afforded 1.
合成了从土曲霉 IFO 6123 和 8835 中分离出来的半合成色素(1)。将溴化吲哚镁(4)与氯甲基吡嗪(5)偶联,得到 2-氯-5-甲氧基-3-甲基-6-[7-(3-甲基-2-丁烯基)吲哚-3-基]甲基吡嗪 1-氧化物(6),然后将其转化为羟肟酸衍生物(8)的铁盐(9)。用 Co(salen)氧化 9 得到 1。