Phosphinic Peptide Matrix Metalloproteinase-9 Inhibitors by Solid-Phase Synthesis Using a Building Block Approach
摘要:
The solid-phase synthesis of an array of different pseudopeptides containing a phosphinic glycine-leucine moiety (-G Psi/{P(O)OH-CH2}L-)([1]) is described. The resulting pseudopeptides were shown to act as matrix metalloproteinase-9 (MMP-9) inhibitors. Starting from available materials, the protected amino acid isosters benzyloxy-carbonyl aminomethylphosphinic acid (glycine analogue) and ethyl alpha-isobutylacrylate (leucine analogue) were synthesized and coupled with the bis(trimethylsilyl)phosphonite. Protective group interchange yielded a protected phosphinic dipeptide building block 1 ready for use in solid-phase peptide synthesis, Solid-phase peptide synthesis was performed with 9-fluorenylmethyloxycarbonyl (Fmoc) chemistry on a polyethylene glycol polyamide (PEGA) support and the coupling of 1 (1.5 equiv) was carried out with standard activation. The P-4-P-2 and P-2'-P-4' positions of the pseudopeptides were designed by analogy of the cleavage sequences of different natural extracellular matrix protein substrates with a synthetic peptide substrate of MMP-9. The crude peptides were obtained in high yield and purity as determined by RP-HPLC, and were characterized by electrospray mass spectrometry and amino acid analysis after purification. Enzyme kinetic investigations with MMP-9 of the purified peptide inhibitors showed Ki values in the range from mM to nM.
作者:Ting Ma、Xiao Fu、Choon Wee Kee、Lili Zong、Yuanhang Pan、Kuo-Wei Huang、Choon-Hong Tan
DOI:10.1021/ja1098353
日期:2011.3.9
A new chiral entity, pentanidium, has been shown to be an excellent chiralphase-transfercatalyst. The enantioselective Michaeladdition reactions of tert-butyl glycinate-benzophenone Schiff base with various α,β-unsaturated acceptors provide adducts with high enantioselectivities. A successful gram-scale experiment at a low catalyst loading of 0.05 mol % indicates the potential for practical applications
Gold-catalyzed sequential annulations towards 3,4-fused bi/tri-cyclic furans involving a [3+2+2]-cycloaddition
作者:Suna Liu、Pu Yang、Shiyong Peng、Chenghao Zhu、Shengyu Cao、Jian Li、Jiangtao Sun
DOI:10.1039/c6cc09154g
日期:——
A gold-catalyzed sequential annulation towards 3,4-fused bicyclic furan compounds has been realized by employing 2-(1-alkynyl)-2-alken-1-ones and 1,3,5-triazines as the starting materials under mild reaction conditions. This protocol features the multiple...
Catalyst-free synthesis of tetrahydropyrimidines <i>via</i> formal [3+3]-cycloaddition of imines with 1,3,5-hexahydro-1,3,5-triazines
作者:Long Chen、Kai Liu、Jiangtao Sun
DOI:10.1039/c7ra11973a
日期:——
tetrahydropyrimidines from readily available starting materials has been developed. This process features an unprecedented intermolecular formal [3+3]-annulation of imines and 1,3,5-hexahydro-1,3,5-triazines under catalyst-free conditions. Importantly, differing from previous transformations, the 1,3,5-triazines are firstly utilized as formal 1,3-dipoles in cycloadditionreactions.
regiodivergent ligand-controlled palladium-catalyzedcycloaddition reaction of vinyloxazolidine-2,4-diones with 1,3,5-triazinanes. In the presence of a diphosphine ligand, the reaction proceeds via a (5+2) cycloaddition pathway to afford 1,3-diazepin-4-ones in excellent yields, while using a monophosphine ligand, the reaction proceeds smoothly via a (3+2) cycloaddition pathway to give imidazolidin-4-ones