Synthesis of the Cytotrienin A CoreviaMetal Catalyzed C−C Coupling
摘要:
A synthetic approach to the C17-benzene ansamycins via metal catalyzed C-C coupling is described. Key bond formations include direct iridium catalyzed carbonyl crotylation from the alcohol oxidation level followed by chelation-controlled Sakurai-Seyferth dienylation to form the stereotriad, which Is attached to the arene via Suzuki cross-coupling. The diene-containing carboxylic acid is prepared using rhodium catalyzed acetylene-aldehyde reductive C-C coupling mediated by gaseous hydrogen. Finally, ring-closing metathesis delivers the cytotrienin core.
A Fast Procedure for the Preparation of Amides/Peptides from Carboxylic Acids and Azides via Two Redox Reactions: Application to the Synthesis of Methionine Enkephalin
作者:Sunil K. Ghosh、Rekha Verma、Usha Ghosh、Vasant R. Mamdapur
DOI:10.1246/bcsj.69.1705
日期:1996.6
A one-pot self regulated approach for the synthesis of amides/peptides based on two reduction–oxidation (redox) reactions has been described. The primary and secondary amides/peptides are made by using azidotrimethylsilane and alkyl azides/α-azido acid derivatives respectively as the direct source of amine components. Benzeneselenol, generated in the reaction medium during carboxyl activation, has
One pot amide/ peptide synthesis via two redox reactions
作者:Sunil K. Ghosh、Usha Singh、Vasant R. Mamdapur
DOI:10.1016/s0040-4039(00)77720-3
日期:1992.2
A new and highly efficient one-pot self-regulated approach to amide/ peptide synthesis has been developed based on two redox reactions using azide as a latent amine component. For the first time, selenophenol, generated in situ has been found to be an effective reducing agent for the conversion of azides to amines.
HIYAMA, TAMEJIRO;KAI, MARIKO, TETRAHEDRON LETT., 1982, 23, N 20, 2103-2104
作者:HIYAMA, TAMEJIRO、KAI, MARIKO
DOI:——
日期:——
Synthesis of the Cytotrienin A Core<i>via</i>Metal Catalyzed C−C Coupling
作者:Michael Rössle、David J. Del Valle、Michael J. Krische
DOI:10.1021/ol200160p
日期:2011.3.18
A synthetic approach to the C17-benzene ansamycins via metal catalyzed C-C coupling is described. Key bond formations include direct iridium catalyzed carbonyl crotylation from the alcohol oxidation level followed by chelation-controlled Sakurai-Seyferth dienylation to form the stereotriad, which Is attached to the arene via Suzuki cross-coupling. The diene-containing carboxylic acid is prepared using rhodium catalyzed acetylene-aldehyde reductive C-C coupling mediated by gaseous hydrogen. Finally, ring-closing metathesis delivers the cytotrienin core.
Synthesis of 1-azidocyclopropanecarboxylates from 2-azido-2alkenoates