The iodocyclization of allylic carbamates 3a and 3b proceeded with high regio- and stereoselection to give 2-oxobicyclo[4.3.0]nonane 5a as the major product. Both the regio- and diastereoselection of the reaction were investigated with the help of molecular mechanics and quantomechanical calculations. The energetic difference between the competing transition states TS-5a and TS-5b is in good agreement
申请人:Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V.
公开号:US10588962B2
公开(公告)日:2020-03-17
The present invention relates to the field of synthesizing and biologically evaluating of a novel class of carbohydrate-based vaccines. The new vaccines consist of a multi-modular structure which allows applying the vaccine to a whole variety of pathogenes. This method allows preparing vaccines against all pathogens expressing immunogenic carbohydrate antigens. As conjugation of antigenic carbohydrates to proteins is not required the conjugate vaccine is particularly heat stable. No refrigeration is required, a major drawback of protein-based vaccines.
作者:Pierre L. Beaulieu、Jean Simon Duceppe、Carolyne Johnson
DOI:10.1021/jo00013a023
日期:1991.6
(R)- or (S)-benzyl 4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate (7a) and (R)- or (S)-1,1-dimethylethyl 4-formyl-2,2-dimethyl-3-oxazolidinecarboxylate (7b), readily available from serine, react with Wittig reagents to give alkenes 8. Selective deprotection followed by oxidation of the resulting unsaturated amino alcohols 9 provides vinylglycines 5 of defined configuration (> 95% ee) and double-bond geometry. D-Vinylglycines are obtained from L-serine, and conversely, D-serine gives beta,gamma-unsaturated amino acids with the L configuration. The double-bond geometry is controlled by the nature of the phosphorous ylide employed. The scope and limitations of this new methodology for the preparation of chiral vinylglycines is examined.
Glycolipids And Analogues Thereof As Antigens For NKT Cells
申请人:Tsuji Moriya
公开号:US20070238871A1
公开(公告)日:2007-10-11
This invention relates to immunogenic compounds which serve as ligands for NKT (natural killer T) cells and to methods of use thereof in modulating immune responses.
GLYCOLIPIDS AND ANALOGUES THEREOF AS ANTIGENS FOR NK T CELLS
申请人:Steinman Ralph M.
公开号:US20090117089A1
公开(公告)日:2009-05-07
This invention relates to immunogenic compounds which may serve as ligands for NKT (natural killer T) cells and to methods of use thereof in modulating immune responses.