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.
that are dealkylated in situ to provide the corresponding furo[2,3-b]pyridin-4(7H)-ones. The same strategy applies to the formation of furo[2,3-b]quinolin-4(9H)-ones. In the case of Me3Si-substituted alkynes, hydration of the triple bond was observed.
ñ -烷基-4-烷氧基-3- alkynylpyridin-2(1 ħ) -酮容易经历酸促进的5-内-heteroannulation到furopyridinium中间产物在原位脱烷基化以提供相应的呋喃并[2,3- b ]吡啶-4(7 H)-ones。相同的策略适用于呋喃[2,3 - b ]喹啉-4(9 H)-ones的形成。在Me 3 Si-取代的炔烃的情况下,观察到三键的水合。
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.
Practical One-Pot Syntheses of Regioisomeric Furan-Fused Pyridinones (and Quinolinones) from Common Precursors
-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