An I(2) promoted domino protocol was developed to construct 2-acylbenzothiazoles from simple and readily available aromatic ketones/unsaturated methyl ketones and o-aminobenzenethiols. The reaction proceeded smoothly under metal-free and peroxide-free conditions.
A short synthesis of (±)-phyllodulcin (1), a sweetprinciple of HydrangeaserrataSeringevar. thunbergiiSugimoto, from the enaminone (2) by annelation with dimethyl 3-oxaglutarate is described.
Biomimetic Organocatalytic Approach to 4-Arylquinolizidine Alkaloids and Application in the Synthesis of (−)-Lasubine II and (+)-Subcosine II
作者:Seerat Virk、Sunil V. Pansare
DOI:10.1021/acs.orglett.9b01840
日期:2019.7.19
An enantioselective, biomimetic organocatalytic synthesis of 4-arylquinolizidin-2-ones, key intermediates in the synthesis of several Lythraceae alkaloids, was developed. The methodology features S-proline-mediated Mannich/aza-Michael reactions of readily available arylideneacetones and Δ1-piperideine. The total syntheses of (−)-lasubine II and (+)-subcosine II as well as the formal syntheses of structurally