Manganese(III) acetate mediated radical reactions leading to araliopsine and related quinoline alkaloids
作者:Gregory Bar、Andrew F Parsons、C.Barry Thomas
DOI:10.1016/s0040-4020(01)00375-1
日期:2001.5
mechanism involves an initial intermolecular radical addition reaction followed by radical oxidation and cyclisation steps. Both angular and linear tricyclic alkaloids can be formed and the regioselectivity of the cyclisation is shown to depend on whether alkyl or arylgroups are attached to the alkene.
-ones undergo cyclization via divergent pathways when heated in acetic acid or triethylamine as reagent-solvent under microwave irradiation to furnish selectively furo[2,3-b]pyridin-4-ones or their regioisomeric furo[3,2-c]pyridin-4-ones, respectively. The same strategy applies to the synthesis of furoquinolinones. annulation - furan - alkyne - cross-coupling reaction - microwave irradiation
3-炔基-4-甲氧基吡啶-2(1 H)-酮在乙酸或三乙胺中作为溶剂在微波辐射下加热,经发散途径环化,选择性地提供呋喃[2,3 - b ]吡啶-4-酮或它们的区域异构体呋喃并[3,2 - c ]吡啶-4-酮。相同的策略适用于呋喃喹啉酮的合成。 环化-呋喃-炔-交叉偶联反应-微波辐射
A radical approach to araliopsine and related quinoline alkaloids using manganese(III) acetate
作者:Gregory Bar、Andrew F Parsons、C.Barry Thomas
DOI:10.1016/s0040-4039(00)01324-1
日期:2000.9
Reaction of 4-hydroxy-1-methyl-2(1H)-quinolone 3 with electron-rich alkenes and manganese(III) acetate produces tricyclic quinoline alkaloids, including araliopsine 1, in one-pot reactions. This combined intermolecular addition-cyclisation reaction produces angular and/or linear tricycles and the regioselectivity of the cyclisation is shown to depend on whether alkyl or aryl substituents are attached to the alkene. (C) 2000 Elsevier Science Ltd. All rights reserved.