Selective Preparation of β-Monoesters of Mercaptosuccinic Acid with Acid or Base Labile Sulfur Protecting Groups and Esters
作者:Linda M. Gustavson、David S. Jones、Jeffrey S. Nelson、Ananthachari Srinivasan
DOI:10.1080/00397919108020819
日期:1991.1
Abstract Sulfur protected mercaptosuccinic acid β-monoesters were prepared by two complimentary methods. Alkylation of enolates of hemithioacetal protected mercaptoacetic acid with t-butyl bromoacetate directly provides the base stable t-butyl esters 2a and 2b. Alternatively, protection of the α-carboxylate and thiol as an oxathiolone permits the preparation of the base labile S-acyl protected mercaptosuccinic
The present invention relates to novel ligands and labelling techniques. The present invention further relates to a diagnostic composition suitable for administration to a warm-blooded animal comprising somatostatin or hirudin or a molecule capable of interacting with the somatostatin receptor or with the hirudin receptor labelled with a radionuclide by means of a chelate ligand capable of administration to an animal to produce reliable visual imaging of tumors or therapeutic effects on tumors and blood clots.