A novel 3,4-dihydroisoquinoline annulation: expedient access to isoquinoline heterocycles
摘要:
3,4-Dihydroisoquinoline carboxylate I undergoes a smooth annulation with omega-bromopropionate, butyrate or ortho-bromomethyl benzoate 2 to afford the isoquinoline heterocycle 3 upon treatment with potassium tert-butoxide in DMF at -60 degrees C. This novel annulation constitutes a formal direct synthesis of cyclic Reissert equivalent compounds, thus offers an expedient access towards certain medicinally important isoquinoline heterocycles and relevant natural alkaloids, that is, of berberine and erythrina types. (c) 2005 Elsevier Ltd. All rights reserved.
Concise total syntheses of berberine and its analogues enabled by trifluoroacetic anhydride-promoted decarbonylative-elimination reaction
作者:Xifei Yan、Jianfeng Zheng、Wei-Dong Z. Li
DOI:10.1016/j.tetlet.2023.154826
日期:2023.11
The total syntheses of berberine hydrochloride and itsanalogues were achieved by a convergent strategy from available meconine derivatives, which were based on base mediated isoquinoline annulation followed by trifluoroacetic anhydride promoted decarbonylative elimination protocol. Key elements of our approach feature divergent synthesis, step-economy manner, multigram scalable synthesis, transition
A novel 3,4-dihydroisoquinoline annulation: expedient access to isoquinoline heterocycles
作者:Wei-Dong Z. Li、Hua Yang
DOI:10.1016/j.tet.2005.03.041
日期:2005.5
3,4-Dihydroisoquinoline carboxylate I undergoes a smooth annulation with omega-bromopropionate, butyrate or ortho-bromomethyl benzoate 2 to afford the isoquinoline heterocycle 3 upon treatment with potassium tert-butoxide in DMF at -60 degrees C. This novel annulation constitutes a formal direct synthesis of cyclic Reissert equivalent compounds, thus offers an expedient access towards certain medicinally important isoquinoline heterocycles and relevant natural alkaloids, that is, of berberine and erythrina types. (c) 2005 Elsevier Ltd. All rights reserved.