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.
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.
A Facile Total Synthesis of Hainanensine via an Unusual Rearrangement−Annulation Cascade
作者:Zhi-Wei Zhang、Wei-Dong Z. Li
DOI:10.1021/ol1003324
日期:2010.4.16
A faciletotalsynthesis of hainanensine (1), a structurally unique Cephalotaxus alkaloid, via an effective acid-mediated rearrangement/Friedel−Crafts annulation cascade (7a/7b → 8a/8b), is described.