Investigation for the cyclization efficiency of linear tetrapeptides: Synthesis of tentoxin B and dihydrotentoxin
作者:Ryota Sato、Kie Oyama、Hiroyuki Konno
DOI:10.1016/j.tet.2018.09.011
日期:2018.10
tentoxin B by the combination of Fmoc solid-phase peptide synthesis and cyclization in solution phase has been reported. An unusual aminoacid, an L-N-methyl-β-hydroxyphenylalanine derivative, which was assembled on solid support, was prepared from ethyl cinnamate. Cyclic tetrapeptide formation and cleavage of benzyl ether were optimized with DIPCI/HOBt/DIPEA and Et3SiH/Pd(OH)2, respectively.
An unconventional approach to peptidecyclization involving the use of acyl ammonium species was developed. Rapid and epimerization/dimerization-free cyclization of synthetically challenging peptides was possible, including a difficult cyclization reaction involving N-methyl amide bond formation. The approach is characterized by ease of purification of the products, high productivity, and high reaction