Investigation of the active turn geometry for the labour delaying activity of indolizidinone and azapeptide modulators of the prostaglandin F2α receptor
From Macrocycle Dipeptide Lactams To Azabicyclo[X.Y.0]alkanone Amino Acids: A Transannular Cyclization Route for Peptide Mimic Synthesis
作者:Simon Surprenant、William D. Lubell
DOI:10.1021/ol0609863
日期:2006.6.1
text] Macrocyclic and fused bicyclic dipeptides are complementary motifs for mimicry of different types of beta-turn geometry. Macrocyclic dipeptidemimics have served as precursors for the synthesis of their bicyclic counterparts using electrophilic transannular cyclizations of 9- and 10-membered ring lactams 9-12 to form azabicyclo[4.3.0]- and -[5.3.0]alkanone amino esters 13-16.
Design, Synthesis, and Conformational Analysis of a Proposed Type I β-Turn Mimic
作者:Brian E. Fink、Phil R. Kym、John A. Katzenellenbogen
DOI:10.1021/ja974023y
日期:1998.5.1
conformational searching has indicated that this ring system would be a good mimic of a type I β-turn. The synthesis of model tri- and tetrapeptide analogues based on 1 is reported. NMR studies indicate that the tetrapeptide derivatives constrain the i+1 and i+2 torsion angles to within 30° of those predicted for an ideal type I β-turn (φ1 = −82°, ψ1 = −20°, φ2 = −107°, ψ2 = −18°) and that this conformation