Studies on pyrrolidinones. Synthesis of<i>N</i>-benzhydrylpyroglutamic acids and esters
作者:Benoît Rigo、Philippe Gautret、Anne Legrand、Jean Pierre Hénichart、Daniel Couturier
DOI:10.1002/jhet.5570350312
日期:1998.5
Catalyzed N-alkylation of N,O-bistrimethylsilyl pyroglutamic acid with trimethylsilyl benzhydryl ethers yields trimethylsilyl N-benzhydrylpyroglutamates. Hydrolysis of these compounds or saponification of the methylesters gives the correspondingacids.
Reaction of trimethylsilyl derivatives with Meldrum's acid : A new and easy monofunctionalization of malonic acid
作者:B. Rigo、D. Fasseur、P. Cauliez、D. Couturier
DOI:10.1016/s0040-4039(00)99406-1
日期:1989.1
Treatment of Meldrum's acid with silylated derivatives (amines, lactams or alcohols) yields very easily monofunctionalized malonic silyl esters. Hydrolysis of these silyl esters leads to the corresponding monoacids with a very good yield.
Studies on pyrrolidinones. Synthesis of 1-[(<i>N</i>-acetylarylamino)methyl]pyroglutamic acid derivatives
作者:Samira El Ghammarti、Benoit Rigo、Hechmi Mejdi、Jean-Pierre Hénichart、Daniel Couturier
DOI:10.1002/jhet.5570350311
日期:1998.5
Pyroglutamic acid was transformed into 1-[(N-Acetylarylamino)methyl]pyroglutamic acid derivatives by using trimethylsilyl variations of the Mannich reaction.
Studies on pyrrolidinones. Synthesis of<i>N</i>-acylpyroglutamic esters with bactericide and fungicide properties
作者:Benoǐt Rigo、Charles Lespagnol、Marc Pauly
DOI:10.1002/jhet.5570250108
日期:1988.1
The best method to prepare N-acylpyroglutamic esters is to react N-trimethylsilylpyroglutamic esters with acid chlorides or diketene. These acylesters possess bactericide and fungicide properties against several microorganisms.
The carbamoylation of some lactams derivatived from pyroglutamic acid as been studied; better yields were obtained starting from the unsubstitued lactam (toluene, 80°) rather than starting with the N-silyllactam (room temperature), although these latter reaction conditions could be interesting for heat sensitive compounds. Methyl and phenyl isothiocyanate react only with the sodium salt of methyl pyroglutamate