Microwave-induced solid-supported Fischer indolization, a key step in the total synthesis of the sempervirine type methoxy analogues
作者:Teodozja Lipińska
DOI:10.1016/j.tetlet.2004.10.008
日期:2004.11
A general protocol for the synthesis of 2-heteroaryl-5-methoxyindoles has been developed utilizing a microwave-induced solid-supported Fischer indolization under controlled conditions This route uses 2-acetylpyridine as a model and 3-acetyl derivatives of cycloalkeno[c]fused pyridines as the synthetic building blocks towards new 9-methoxyindolo[2,3-a]quinolizine alkaloids.
对于2 -杂芳基-5- methoxyindoles合成的一般协议已被开发利用在受控条件下微波诱导的固体负载的Fischer吲哚此路线使用2-乙酰基作为cycloalkeno的模型和3-乙酰基衍生物[ C ^ ]熔融吡啶作为合成原料,可阻止新的9-甲氧基吲哚并[2,3- a ]喹诺嗪生物碱。
A New Approach to Difficult Fischer Synthesis: The Use of Zinc Chloride Catalyst in Triethylene Glycol under Controlled Microwave Irradiation
作者:Teodozja M. Lipińska、Stefan J. Czarnocki
DOI:10.1021/ol052255t
日期:2006.2.1
chloride (ZnCl2/TEG) is described as a new and efficient reaction medium for a difficult Fischer synthesis, leading to sensitive indoles. Transformation of the 3-acetyl-1-methylthiocycloalka[c]pyridine phenylhydrazones and p-methoxyphenylhydrazones into the 2-(2-pyridyl)indoles and 5-methoxy-2-(2-pyridyl)indoles, which are the synthons in our total synthesis of the sempervirine-type alkaloids, is carried