Functionalized Polyhydroquinolines from Amino Acids Using a Key One-Pot Cyclization Cascade and Application to the Synthesis of (±)-Δ<sup>7</sup>-Mesembrenone
developed a one-pot cyclization cascade with high chemocontrol and diastereoselectivity. The sequence generates two cycles, three carbon–carbon bonds, and an all-carbon quaternary center in a highly convergent process. Functionalized polyhydroquinolines and congeners can be accessed from commercially available amino acids. This versatile and robust strategy was applied to the synthesis of (±)-Δ7-mesembrenone
Pyrone Diels-Alder Routes to Indolines and Hydroindolines: Syntheses of Gracilamine, Mesembrine, and Δ<sup>7</sup>-Mesembrenone
作者:Pei Gan、Myles W. Smith、Nathaniel R. Braffman、Scott A. Snyder
DOI:10.1002/anie.201510520
日期:2016.3.7
Although the Diels–Alder reaction has long been utilized for the preparation of numerous heterocycles, opportunities to extend its power remain. Herein, we detail a simple, modular, and robust approach that combines various amines regioselectively with 4,6‐dichloropyrone to create substrates which, under appropriate conditions, can directly deliver varied indolines and hydroindolines through [4+2]
An unprecedented palladium-catalyzed sequential procedure toward arylation and allylic alkylation of highly functionalized cyclohexenones was developed. This new protocol leads to useful building blocks containing a benzylic quaternary carbon in only one step. A concise total synthesis of mesembrine based on this procedure was achieved in only five steps with 22% overall yield.
Formal syntheses of (±)-mesembrine and (±)-dihydromaritidine
作者:Joseph P. Michael、Arthur S. Howard、Ruth B. Katz、Mzwandile I. Zwane
DOI:10.1016/s0040-4039(00)61117-6
日期:1992.9
3-oxopent-4-enoate 3 followed by treatment with trifluoroacetic acid yielded the alkaloid Δ7-mesembrenone 1 and its N-benzyl analogue 10. These compounds are intermediates in formal syntheses of (±)-mesembrine 6 and (±)-dihydromaritidine 13.
The present invention relates to anti-cancer compositions based on extracts of a plant from the Mesembryanthemaceae family, in particular Mesembryanthemum tortuosum (Sceletium tortuosum), their use in the treatment of cancer, and methods of manufacturing the compositions. The anti-cancer compositions of the present invention include Δ7 mesembrenone.