Tricyclic Imidazolidin-4-ones by Witkop Oxidation of Tetrahydro-β-carbolines
作者:Derek A. Leas、Yuxiang Dong、Jered C. Garrison、Xiaofang Wang、Edward L. Ezell、Douglas E. Stack、Jonathan L. Vennerstrom
DOI:10.1021/acs.joc.9b03402
日期:2020.2.21
periodate oxidativeringexpansion in the presence of formaldehyde and other aldehydes to form 5,6-dihydro-7H-1,4-methanobenzo[e][1,4]diazonine-2,7(3H)-diones in 30-81% yield. In most cases, the reaction to form this new 6/8/5-tricyclic ring system proceeds with high diastereoselectivity. These benzannulated medium-ring keto imidazolidin-4-ones expand the menu of tetrahydro-β-carboline oxidation products
Pictet–Spengler reactions of oxetan-3-ones and related heterocycles
作者:Benjamin O. Beasley、Abimbola Alli-Balogun、Guy J. Clarkson、Michael Shipman
DOI:10.1016/j.tetlet.2013.11.077
日期:2014.1
Pictet–Spengler reactions of oxetan-3-ones and azetidin-3-ones with tryptamine and tryptophan derivatives produce spirocyclic tetrahydro-β-carbolines in good yields. Molecular iodine (5 mol %) is an effective catalyst in most cases and high levels of diastereoselectivity are witnessed using2-substituted oxetan-3-ones.