A rapid and efficient Fmoc solid-phase synthesis of halicylindramide A is described. The strategy comprises resin attachment of the first amino acid via the side chain of aspartic acid, stepwise solid-phase synthesis of the linear peptide analog LIP to the cysteine residue, on-resin head-to-tail cyclization and linear peptide synthesis of the N-terminal region, and finally cysteine oxidation and formylation. The stereochemistry of the halicylindramide A was confirmed by comparison of NMR and RP-HPLC data with the natural molecule. A distinctive conformational change was observed from the CD spectra of the halicylindramide A in sodium dodecyl sulfate.
Solid phase-supported synthesis is a widely used strategy in peptide chemistry. A factor which limits the product purity is the individual stages yields. Here, we reported that the use of ultrasonic agitation allows to reduce tenfold the time of synthesis in the Fmoc strategy and improve the purity of the final product. Our method is a promising alternative to traditional synthetic methods and microwave
Total Chemical Synthesis of an Intra‐A‐Chain Cystathionine Human Insulin Analogue with Enhanced Thermal Stability
作者:John A. Karas、Nitin A. Patil、Julien Tailhades、Marc‐Antoine Sani、Denis B. Scanlon、Briony E. Forbes、James Gardiner、Frances Separovic、John D. Wade、Mohammed Akhter Hossain
DOI:10.1002/anie.201607101
日期:2016.11.14
A‐chain. Reported herein is an efficient method for forming this mimic using simple monomeric building blocks. The intra‐A‐chaincystathionineinsulinanalogue was obtained in good overall yield, chemically characterized and demonstrated to possess native binding affinity for the insulin receptor isoform B. It was also shown to possess significantly enhancedthermalstability indicating potential application