Silver-catalyzed spirolactonization: first synthesis of spiroisoindole-γ-methylene-γ-butyrolactones
摘要:
gamma-Acetylenic carboxylic acids are cyclized to spirolactones under mild conditions, in the presence of Ag2CO3 catalyst. The corresponding spiro-5-alkylidene-gamma-butyrolactones were isolated in high yields, and this process constitutes an easy and efficient route to analogous structures of natural products of biological interest. (c) 2008 Elsevier Ltd. All rights reserved.
Halolactonization of g-Acetylenic Acids: Synthesis of Novel Spiroisoindole Halobutyrolactones
作者:Mohamed Othman、Mohamed M. Rammah、Moncef Msaddek、Mohamed B. Rammah
DOI:10.3987/com-08-11370
日期:——
A Convenient Synthesis of Novel Spiroisoindole γ-Halobutyrolactones via Halocyclization of γ-Ethylenic Acids
作者:Mohamed Othman、Mohamed M. Rammah、Kabula Ciamala、Michael Knorr、Carsten Strohmann、Mohamed B. Rammah
DOI:10.3987/com-09-11787
日期:——
gamma-Ethylenic carboxylic acids are cyclized to spirolsoindolone gamma-halomethylbutyrolactones, in the presence of NBS or NIS and K2CO3. The corresponding haloaspirobutyrolactones were isolated in high yields (57-95%).
Silver-catalyzed spirolactonization: first synthesis of spiroisoindole-γ-methylene-γ-butyrolactones
作者:Mohamed M. Rammah、Mohamed Othman、Kabula Ciamala、Carsten Strohmann、Mohamed B. Rammah
DOI:10.1016/j.tet.2008.01.137
日期:2008.4
gamma-Acetylenic carboxylic acids are cyclized to spirolactones under mild conditions, in the presence of Ag2CO3 catalyst. The corresponding spiro-5-alkylidene-gamma-butyrolactones were isolated in high yields, and this process constitutes an easy and efficient route to analogous structures of natural products of biological interest. (c) 2008 Elsevier Ltd. All rights reserved.
Aza-heterocyclic frameworks through intramolecular π-system trapping of spiro-<i>N</i>-acyliminiums generated from isoindolinone
作者:Sarra Chortani、Mohamed Othman、Ata Martin Lawson、Anis Romdhane、Hichem Ben Jannet、Michael Knorr、Lukas Brieger、Carsten Strohmann、Adam Daïch
DOI:10.1039/d0nj04052e
日期:——
spiro-isoindolinone-imides. The latter were produced in large scale in three steps from homophthalic acid. These imides were useful to provide in one step isoindolinones bearing hydroxymethyl-amide functions, tethered at quaternary carbon centre with promising biological issues. Submitted to Brønsted (TFA neat) and Lewis acid (trimethylsilyltrifluoro-methanesulfonic (TMSOTf) 10 mol%), the spiro-acetoxylactams undergo