HBTU Mediated Synthesis of α,β‐Unsaturated γ‐Lactams from <i>E</i>‐α,β‐Unsaturated γ‐Amino Acids
作者:Manjeet Singh、Sachin A. Nalawade、DRGKoppalu. R. Puneeth Kumar、Kuruva Veeresh、Saikat Pahan、Sanjit Dey、Hosahudya N. Gopi
DOI:10.1002/ejoc.202300682
日期:2023.10.2
The direct transformation of N-protected α,β-unsaturated γ-amino acids into corresponding α,β-unsaturated γ-lactams through in situ activation of carboxylic acid using the peptide coupling agent HBTU in the presence of base DIPEA is reported. The transformation involves the trans to cis isomerization of carbon-carbon double bonds.
Hybrid Peptides: Direct Transformation of α/α, β-Unsaturated γ-Hybrid Peptides to α/γ-Hybrid Peptide 12-Helices
作者:Anupam Bandyopadhyay、Hosahudya N. Gopi
DOI:10.1021/ol300987d
日期:2012.6.1
A smooth transformation of unusual planar structures of alpha/vinylogous hybrid peptides to ordered alpha/gamma(4)-hybrid peptide 12-helices and the stereo-chemical preferences of vinylogous amino acid residues in single crystals are studied.