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
Mojzych; Rykowski, Polish Journal of Chemistry, 2003, vol. 77, # 12, p. 1797 - 1803
作者:Mojzych、Rykowski
DOI:——
日期:——
General route to the total synthesis of sempervirine analogues containing modified E rings, potential cytostatics
作者:Teodozja Lipińska
DOI:10.1016/s0040-4039(02)02389-4
日期:2002.12
obtained via inverse electron demand Diels–Alder reactions of 5-acetyl-3-(methylsulfanyl)-1,2,4-triazine with cyclic enamines (formation of D and E rings) followed by Fischer indole synthesis under microwave irradiation on solid support (formation of A and B rings) and subsequent annulation of indole derivatives 10a–c via a directedmetallationroute (formation of C rings).
Experimental and theoretical FMO interaction studies of the Diels–Alder reaction of 5-acetyl-3-methythio-1,2,4-triazine with cyclic enamines
作者:Teodozja Lipińska
DOI:10.1016/j.tet.2005.06.043
日期:2005.8
indicated that their reactivity differences can be explained by an influence of steric hindrance in the considered transition state. In result, the synthesis of the 3-acetyl-1-methylthiocycloalka[c]pyridines, as synthons for preparation of sempervirine and its analogues has been optimized. The subsequent side reaction has been detected as a serious problem, especially in the case of the six-membered