New Methods and Reagents in Organic Synthesis. 59. Lithium Trimethylsilydiazomethane: A New Synthon for the Preparation of 5-Substituted 1,2,3-Thiadiazoles
作者:Toyohiko Aoyama、Yuji Iwamoto、Takayuki Shioiri
DOI:10.3987/r-1986-03-0589
日期:——
Mono S-trimethylsilyl ketene dithioacetals as versatile tools for the synthesis of α-hydrazinodithioesters. A novel access to endothiopeptides.
作者:Pierre Beslin、Philippe Marion
DOI:10.1016/s0040-4039(00)91580-6
日期:1992.2
Mono-S-trimethylsilylketene dithioacetals have been prepared from dithioesters by the action of trimethylsilyl iodide formed in situ. They were reacted easily with dialkylazodicarboxylates to give good yields of alpha-hydrazinodithioesters. The latter were transformed into thioamides or endothiodipeptides by aminolysis either with an amine or an amino acid.
Highly Chemoselective Oxidation of Dithioester Enethiolates to Sulfenates: Application to the Synthesis of Ketene Dithioacetal <i>S</i>-Oxides
Enethiolates derived from dithioesters were efficiently converted into the corresponding vinyl sulfenates by oxidation with a unique N-sulfonyloxaziridine la derived from pinacolone. Subsequent alkylation with alkyl halides led to ketene dithioacetal S-oxides in good to excellent yields.
Synthesis, characterization and blood cell labelling evaluation of new 99mTc nitrido radiopharmaceuticals with thioamide [R1C(=S)NHR2] derivatives
The synthesis of a series of new Tc-99m-thioamide complexes with the [Tc=N](2+) nitrido core, in which the thioamide ligand substituents were varied to include different lengths of aliphatic alkyl chains or a phenyl group is reported TLC analysis shows that the complexes are neutral and lipophilic compounds. The Tc-99m complexes have a low blood cell labelling efficiency in whole blood compared to the reference complex of dithiocarbamate (TcN)-Tc-99m(Et(EtO)NCS2)(2).
DAVY, H.;METZNER, P., J. CHEM. RES. SYNOP., 1985, N 8, 272