Indole-3-pyruvic acid oxime ethers and thieno analogues by Heck cyclisation. Application to the synthesis of thia-tryptophans
作者:David Wensbo、Salo Gronowitz
DOI:10.1016/0040-4020(96)00909-x
日期:1996.11
thienoamines (16,18,20) employing methyl or benzyl oxime ethers of ethyl (E)-2-oxo-5-bromo-3-pentenoate 2a, followed by palladium-catalysed Heck cyclisation yielded oxime ethers of Bz-substituted ethyl indole-3-pyruvates (15a-f) and thienopyrroles (17,19,21–23). Attempted conversion of 2a into the corresponding tosyl hydrazone or oxime resulted in formation of pyridazine (10) and oxazine (13) derivatives.
Ñ的-allylation Ñ -BOC取代ø碘苯胺(14A-E )和thienoamines(16,18,20)采用乙基的甲基或苄基的肟醚(E)-2-氧代-5-溴-3-戊烯酸酯2A然后,钯催化的Heck环化反应生成Bz取代的乙基吲哚-3-丙酮酸酯(15a-f)和噻吩并吡咯(17,19,21–23)的肟醚。尝试将2a转化为相应的甲苯磺隆hydr或肟导致形成哒嗪(10)和恶嗪(13)衍生产品。通过还原肟双键,从相应的甲基肟醚中获得作为乙基酯的噻吨-色氨酸的三种可能的异构体。