Abstract A very short, high‐yielding, one‐pot procedure has been developed for the preparation of half‐protected cyclobutane‐1,2‐dione. This compound is much more stable than cyclobutane‐1,2‐dione itself and allowed further transformation to give diprotected cyclobutanetrione equivalents.
Dimethanesulphonylthioalkanes and analogous compounds were synthesized by the reaction of corresponding sodium thiosulphonate and appropriate dibromide to test the carcinostatic activity compaed with Myleran. It was found that some of these compounds inhibited pronouncedly the growth of the solid tumor produced by Ehrlich ascites carcinoma cells.
Bile acids and related compositions and methods of synthesis and use. More specifically, deoxycholic acid and related compositions, said compositions being free of all moieties of animal origin and free of pyrogenic moieties.
Synthesis of the Core Ring System of the Antiosteoporotic Citrofulvicin
作者:Kalina Doytchinova、Jeffrey D. Winkler
DOI:10.1021/acs.orglett.1c01216
日期:2021.6.18
Synthesis of the octacyclic ringsystem of citrofulvicin is described in nine steps from readily available starting materials. Blocking undesired intramolecular cyclization of a reactive β-diketone intermediate by transient incorporation of a dithiolane ring led to the formation of the requisite 1-hydroxy-2,4,6-trioxaadamantane ringsystem of citrofulvicin.