A formal synthesis of (±)-aristeromycin starting from the imino Diels-Alder cycloadduct 3a has been achieved with high overall yield. A novel method for the in situ preparation of N-sulfonylimines is reported.
A new double asymmetric induction in carbon-carbon bond formation is achieved by the use of palladium chiral complexes in the alkylation of chiral Schiffbases derived from glycine. High diastereoisomeric excesses are obtained (90–99%) using N,N-cyclohexylsulfamoylisobornyl derivatives and DIOP as a matched pair.
A radical-organometallic glycine synthon. Preparation of homochiral heterocyclic α-amino acids
作者:María E. Lloris、Marcial Moreno-Mañas
DOI:10.1016/s0040-4039(00)61614-3
日期:1993.10
Co)Acac)2 reacts with (1) and (d)-menthyl N-BOC-2-bromoglycinates to give (1)- and (d)-menthyl N-BOC 3-acetylnorvalinates, which are converted into homochiral 2-(3,5-dimethyl-4-pyrazolyl)glycine and 2-(3,5-dimethyl)-4-isoxazolylglycine.
Polysaccharides comprising carboxyl functional groups substituted by a hydrophobic alcohol derivative
申请人:Soula Remi
公开号:US20100167991A1
公开(公告)日:2010-07-01
The invention relates to a polysaccharide comprising carboxyl functional groups, one at least of which is substituted by a derivative of a hydrophobic alcohol. The invention also relates to a pharmaceutical composition comprising one of the polysaccharides according to the invention and at least one active principle. It also relates to a pharmaceutical composition, wherein the active principle is chosen from the group consisting of proteins, glycoproteins, peptides and nonpeptide therapeutic molecules. The invention also relates to the use of the functionalized polysaccharides according to the invention in the preparation of pharmaceutical compositions as described above.