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.
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
Studies on pyrrolidinones. Synthesis and reactivity of some<i>n</i>-protected pyroglutamic derivatives
作者:BenoÎT Rigo、BÉNÉDicte Erb、Samira El Ghammarti、Philippe Gautret、Daniel Couturier
DOI:10.1002/jhet.5570320532
日期:1995.9
The synthesis of pyroglutamoyl chloride N-protected by a methoxycarbonyl or a trifluoroacetyl group is described. Some aspects of the reactivity of these compounds and intermediates have been studied.