Systematic Study of the Synthesis of Macrocyclic Dipeptide β-Turn Mimics Possessing 8-, 9-, and 10- Membered Rings by Ring-Closing Metathesis
作者:Ramesh Kaul、Simon Surprenant、William D. Lubell
DOI:10.1021/jo0477648
日期:2005.5.1
A systematicstudy was performed to establish general synthesis protocols for forming enantiomerically pure macrocyclicdipeptide lactams. Focusing on macrocycles of 8-, 9-, and 10-memberedrings, effective syntheses were achieved by a sequence featuring peptide coupling of allyl- and homoallyl-glycine building blocks followed by ring-closingmetathesis. The 8-membered lactam-possessing cis-amide and
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.
Provided herein are antibacterial compounds, wherein the compounds in some embodiments have broad spectrum bioactivity. In various embodiments, the compounds act by inhibition of bacterial type 1 signal peptidase (SpsB), an essential protein in bacteria. Pharmaceutical compositions and methods for treatment using the compounds described herein are also provided.
Synthesis of Macrocyclic β-Strand Templates by Ring Closing Metathesis
作者:Andrew D. Abell、Nathan A. Alexander、Steven G. Aitken、Hongyuan Chen、James M. Coxon、Matthew A. Jones、Stephen B. McNabb、Andrew Muscroft-Taylor
DOI:10.1021/jo802723w
日期:2009.6.5
We report the synthesis of macrocycles 1−6 via ringclosingmetathesis of dienes 7−12. Addition of chlorodicyclohexylborane to thermal and microwave assisted RCM of dienes 8 and 9 markedly improves the yield. The geometric isomers of macrocycles 1−3 and 5 have been assigned using X-ray crystallography and NMR.
Picolinamides and Iodoalkynes Enable Palladium‐Catalyzed
<i>syn</i>
‐Aminoalkynylation of Di‐ and Trisubstituted Alkenes to Give Pyrrolidines
作者:Nicolas Müller、Benedikt S. Schreib、Sebastian U. Leutenegger、Erick M. Carreira
DOI:10.1002/anie.202204535
日期:2022.9.19
A palladium-catalyzed, syn-selective aminoalkynylation of mono-, di- and trisubstituted olefins to afford pyrrolidines is developed. The combination of iodoalkynes and a picolinamide as nucleophile is shown to be essential for the observed reactivity. Furthermore, the picolinamide enables the rapid synthesis of cyclization substrates through a C−H activation approach.