Beyond the Diketopiperazine Family with Alternatively Bridged Brevianamide F Analogues
摘要:
A method for the preparation of 3,5-bridged piperazin-2-ones from a tryptophan proline-based diketopiperazine is described using diphosgene to induce the ring closure. Density functional theory calculations were conducted to study the mechanism of this C-C bond formation. Several derivatives of the thus obtained alpha-chloroamine were synthesized by substitution of the chlorine atom using a range of O-, N-, S-, and C-nucleophiles. This novel class of brevianamide F analogues possess interesting breast cancer resistance protein inhibitory activity.
Beyond the Diketopiperazine Family with Alternatively Bridged Brevianamide F Analogues
摘要:
A method for the preparation of 3,5-bridged piperazin-2-ones from a tryptophan proline-based diketopiperazine is described using diphosgene to induce the ring closure. Density functional theory calculations were conducted to study the mechanism of this C-C bond formation. Several derivatives of the thus obtained alpha-chloroamine were synthesized by substitution of the chlorine atom using a range of O-, N-, S-, and C-nucleophiles. This novel class of brevianamide F analogues possess interesting breast cancer resistance protein inhibitory activity.
Complete Decoration of the Indolyl Residue in <i>cyclo</i>-<scp>l</scp>-Trp-<scp>l</scp>-Trp with Geranyl Moieties by Using Engineered Dimethylallyl Transferases
作者:Ge Liao、Peter Mai、Jie Fan、Georg Zocher、Thilo Stehle、Shu-Ming Li
DOI:10.1021/acs.orglett.8b03124
日期:2018.11.16
for prenyl donor selectivity in six dimethylallyl transferases significantly increased their activities toward geranyl diphosphate. Forty-two geranylated derivatives were obtained from 15 cyclic dipeptides by using the engineered enzymes. Taking cyclo-l-Trp-l-Trp as an example, the geranyl moiety can be attached to all seven possible positions of the indole nucleus. This study demonstrates a convenient
A series of C2-arylated analogues of the diketopiperazine brevianamide F has been synthesized using a mild Pd-catalyzed CH-activation procedure. Biological evaluation of the new derivatives in different cell lines shows that this modification is responsible for the remarkable change in activity, turning a mild antibiotic and antifungal natural product (brevianamide F) into novel antitumoral compounds. Furthermore, the approach stated represents a new straightforward and versatile methodology with promising applications in peptidomimetics and medicinal chemistry.
Prenylation at the indole ring leads to a significant increase of cytotoxicity of tryptophan-containing cyclic dipeptides
作者:Beate Wollinsky、Lena Ludwig、Alexandra Hamacher、Xia Yu、Matthias U. Kassack、Shu-Ming Li
DOI:10.1016/j.bmcl.2012.04.119
日期:2012.6
lines. Preliminary results have been clearly shown that prenylation at C2 led to a significant increase of the cytotoxicity of the tested cyclicdipeptides in all the 14 cases. The second amino acid and the stereochemistry of tryptophan moiety of the cyclicdipeptides showed less influence on the cytotoxicity of the tested compounds.
Breaking the regioselectivity of indole prenyltransferases: identification of regular C3-prenylated hexahydropyrrolo[2,3-b]indoles as side products of the regular C2-prenyltransferase FtmPT1
作者:Beate Wollinsky、Lena Ludwig、Xiulan Xie、Shu-Ming Li
DOI:10.1039/c2ob26149a
日期:——
mixtures of FtmPT1 with these cyclicdipeptides revealed the presence of additional product peaks in the HPLC chromatograms. Seven regularly C3-prenylated hexahydropyrrolo[2,3-b]indoles were isolated and identified by HR-ESI-MS and NMR analyses including HMBC, HMQC and NOESY experiments. Further experiments proved that the C2- and C3-prenylated products are both independent enzyme products. To the best of
Synthesis and evaluation of microtubule assembly inhibition and cytotoxicity of prenylated derivatives of cyclo-l-Trp-l-Pro
作者:Juan F Sanz-Cervera、Emily M Stocking、Takeo Usui、Hiroyuki Osada、Robert M Williams
DOI:10.1016/s0968-0896(00)00171-1
日期:2000.10
The synthesis of three isoprenylated derivatives of cyclo-L-Trp-L-Pro is described. These substances have been evaluated for cytotoxic activity in rat normal fibroblast 3Y1 cells and have also been evaluated in vitro for the inhibition of microtubule assembly. (C) 2000 Elsevier Science Ltd. All rights reserved.