Synthesis of Pro-Pro-Ile, a corticoliberin fragment, labeled with tritium in proline unit
摘要:
Boc-Delta(3)Pro-Pro-Ile-OBzl and Boc-Pro-Delta(3)Pro-Ile-OBzl were synthesized. Tritium-labeled Pro-Pro- Ile was prepared by their hydrogenation in a tritium atmosphere in the presence of a catalyst. In the reduction of Boc-Delta(3)Pro-Pro-Ile-OBzl and Boc-Pro-Delta(3)Pro-Ile-OBzl, elimination of the Bzl protective group occurs faster than hydrogenation of the 3,4-dehydroproline residue (benzene and dioxane were used as solvents). The resulting Boc-Delta(3)Pro-Pro-Ile-OH. and Boc-Pro-Delta(3)Pro-Ile-OH. are poorly soluble in aprotic solvents, which accounts for the low yield of the desired tritium-labeled peptides.
Synthesis of Pro-Pro-Ile, a corticoliberin fragment, labeled with tritium in proline unit
摘要:
Boc-Delta(3)Pro-Pro-Ile-OBzl and Boc-Pro-Delta(3)Pro-Ile-OBzl were synthesized. Tritium-labeled Pro-Pro- Ile was prepared by their hydrogenation in a tritium atmosphere in the presence of a catalyst. In the reduction of Boc-Delta(3)Pro-Pro-Ile-OBzl and Boc-Pro-Delta(3)Pro-Ile-OBzl, elimination of the Bzl protective group occurs faster than hydrogenation of the 3,4-dehydroproline residue (benzene and dioxane were used as solvents). The resulting Boc-Delta(3)Pro-Pro-Ile-OH. and Boc-Pro-Delta(3)Pro-Ile-OH. are poorly soluble in aprotic solvents, which accounts for the low yield of the desired tritium-labeled peptides.
Synthesis and Biological Evaluation of Vinca Alkaloids and Phomopsin Hybrids
作者:Quoc Anh Ngo、Fanny Roussi、Anthony Cormier、Sylviane Thoret、Marcel Knossow、Daniel Guénard、Françoise Guéritte
DOI:10.1021/jm801064y
日期:2009.1.8
Ten hybrids of vinca alkaloids and phomopsin A have been synthesized by linking the octahydrophomopsin lateral chain to the tertiary amine of the cleavamine moiety of anhydrovinblastine (AVLB) and vinorelbine. These compounds have been elaborated in order to obtain original products that may interfere with both binding sites of vinblastine (VLB) and phomopsin in tubulin. Although NMR and molecular modeling studies have shown that the orientation of the added peptide chains of these hybrids is not the same as those of phomopsin A, most of them are very potent inhibitors of microtubules assembly and they present good cytotoxicity against KB cell line. These interesting biological activities may eventually be explained by the fact that their lateral chain resides in a pocket distinct from that of the phomopsin A peptide, at the interface of tubulins beta and alpha.