A rapid and atom economical multicomponent synthesis of complex aza-diketopiperazines (aza-DKPs) driven by Rh(I)-catalyzed hydroformylation of alkenylsemicarbazides is described. Combined with catalytic amounts of acid and the presence of nucleophilic species, this unprecedented multicomponent reaction (MCR) enabled the formation of six bonds and a controlled stereocenter from simple substrates. The
N-Substituted 3-Acetyltetramic Acid Derivatives as Antibacterial Agents
作者:Raghunandan Yendapally、Julian G. Hurdle、Elizabeth I. Carson、Robin B. Lee、Richard E. Lee
DOI:10.1021/jm701356q
日期:2008.3.13
expand the structure-activity relationship of tetramic acid molecules with structural similarity to the antibiotic reutericyclin, 22 compounds were synthesized and tested against a panel of clinically relevant bacteria. Key structural changes on the tetramic acid core affected antibacterial activity. Various compounds in the N-alkyl 3-acetyltetramic acid series exhibited good activity against Gram-positive
Carboxamidomethyl esters (CAM esters) as carboxyl protecting groups.
作者:Jean Martinez、Jeanine Laur、Bertrand Castro
DOI:10.1016/s0040-4039(00)88401-4
日期:1983.1
The carboxamidomethyl esters (CAM esters) are proposed for carboxyl protection in peptide synthesis. Amino acid CAM ester derivatives were easily prepared and showed good stability in the deblocking conditions of other common protectinggroups used in peptide synthesis. The CAM esters were selectively and rapidly hydrolyzed in an alcaline medium.
Facile Synthesis of β-Amino
Disulfides, Cystines, and Their Direct Incorporation into
Peptides
作者:Srinivasan Chandrasekaran、Nasir Baig R. B.、Catherine Kanimozhi、V. Sai Sudhir
DOI:10.1055/s-0028-1088133
日期:——
the synthesis of beta-amino disulfides by regioselectiveringopening of sulfamidates with benzyltriethylammonium tetrathiomolybdate [BnNEt3](2)MoS4. Stability and reactivity of different protecting groups under the reaction conditions have been discussed. This methodology has also been extended to serine and threonine derived sulfamidates to furnish cystine and 3,3'-dimethyl cystine derivatives.
A facile stereospecific synthesis of α-hydrazino esters
作者:Umut Oguz、Garett G. Guilbeau、Mark L. McLaughlin
DOI:10.1016/s0040-4039(02)00352-0
日期:2002.4
A convenient route to make α-hydrazino esters from their corresponding α-amino esters is reported. A key step is selective nitrosamine reduction using activated Zn, conc. HCl, and methanol at low temperatures giving nearly quantitative yields of the pure α-hydrazino esters