氯化铋(III)催化一锅三组分Povarov反应的非对映选择性合成四氢和二氢吡啶并[2,3- c ]香豆素衍生物
摘要:
通过BiCl 3催化的芳香醛,3-氨基香豆素和亲二烯体的一锅三组分aza-Diels-Alder反应,实现了对四氢和二氢吡啶并[2,3- c ]香豆素衍生物的非对映选择性合成。NOE研究证明,在所有情况下均以高选择性获得外型异构体。该反应在室温下进行,从而提供了良好的产物收率以及在广泛的底物上的适用性。在所有合成的衍生物中,与其他测试的衍生物相比,化合物4i和4k显示出有希望的DPPH自由基清除活性。
Povarov Reactions Involving 3-Aminocoumarins: Synthesis of 1,2,3,4-Tetrahydropyrido[2,3-<i>c</i>]coumarins and Pyrido[2,3-<i>c</i>]coumarins
作者:Amit A. Kudale、Jamie Kendall、David O. Miller、Julie L. Collins、Graham J. Bodwell
DOI:10.1021/jo801411p
日期:2008.11.7
Yb(OTf)3 to afford 1,2,3,4-tetrahydropyrido[2,3-c]coumarins. Yields were generally good, but the diastereomeric ratios were highly variable. The products arose through a formal [4 + 2] cycloaddition (inverse electron demand Diels-Alder reaction) followed by tautomerization. As such, these are examples of the Povarov reaction. A range of 1,2,3,4-tetrahydropyrido[2,3-c]coumarins was then synthesized using a
Synthesis of fused tetrahydropyrido[2,3-c]coumarin derivatives as potential inhibitors for dopamine d3 receptors, catalyzed by hydrated ferric sulfate
作者:Deb K. Das、Satavisha Sarkar、Abu T. Khan、Parameswaran Saravanan、Sanjukta Patra
DOI:10.1039/c3ra45174g
日期:——
Fused furo- and pyrano-tetrahydropyrido[2,3-c]coumarin derivatives were synthesized using one-pot three component reactions between aromatic aldehydes, 3-aminocoumarins and cyclic enol ethers in the presence of 10 mol% hydrated ferric sulphate [Fe2(SO4)3·xH2O] in refluxing acetonitrile. The salient features of the present protocol are good yields, high diastereoselectivities, application to a wide
稠合的呋喃并吡喃和四氢吡啶并[2,3- c ^ ]香豆素衍生物用一锅煮的芳香醛之间3-氨基香豆素和环烯醇醚三个组分反应,在10的存在摩尔%水合硫酸铁的[Fe合成2( SO 4)3 · x H 2 O]在回流的乙腈中。本方案的显着特征是收率高,非对映选择性高,使用廉价,易于获得和可回收的催化剂应用于环境广泛的底物以及对环境无害的反应条件。
A diastereoselective synthesis of tetrahydro- and dihydro-pyrido[2,3- c ]coumarin derivatives via a one-pot three-component Povarov reaction catalyzed by bismuth(III) chloride
A diastereoselective synthesis of tetrahydro- and dihydro-pyrido[2,3-c]coumarin derivatives has been achieved via a one-pot three-component aza-Diels–Alder reaction of aromatic aldehydes, 3-aminocoumarin and dienophiles catalyzed by BiCl3. NOE studies proved that exo-isomers were obtained in all cases with high selectivity. The reaction proceeded at room temperature providing good yields of products
通过BiCl 3催化的芳香醛,3-氨基香豆素和亲二烯体的一锅三组分aza-Diels-Alder反应,实现了对四氢和二氢吡啶并[2,3- c ]香豆素衍生物的非对映选择性合成。NOE研究证明,在所有情况下均以高选择性获得外型异构体。该反应在室温下进行,从而提供了良好的产物收率以及在广泛的底物上的适用性。在所有合成的衍生物中,与其他测试的衍生物相比,化合物4i和4k显示出有希望的DPPH自由基清除活性。