Late-stage peptide and protein modifications through phospha-Michael addition reaction
作者:Pei-Yang He、Huai Chen、Hong-Guo Hu、Jin-Jian Hu、Yeh-Jun Lim、Yan-Mei Li
DOI:10.1039/d0cc04969g
日期:——
We developed a late-stage modification strategy by a phospha-Michael addition reaction between various functional phosphines and unprotected dehydroalanine (Dha) peptides and proteins under mild conditions. This strategy was applied to generate a staple peptide to enhance its cell membrane penetrability, and it was also able to regulate α-synuclein aggregation properties and morphological characteristics
initiated an increased demand for azido and alkyne derivatives of aminoacid as precursors for the synthesis of clicked peptides. However, the use of azido and alkyne aminoacids in peptide chemistry is complicated by their high cost. For this reason, we investigated the possibility of the in‐house preparation of a set of five Fmoc azido aminoacids: β‐azido l‐alanine and d‐alanine, γ‐azido l‐homoalanine, δ‐azido
CuI 催化点击化学的兴起引发了对氨基酸的叠氮基和炔烃衍生物作为点击肽合成前体的需求增加。然而,叠氮基和炔氨基酸在肽化学中的使用因其高成本而变得复杂。为此,我们研究了内部制备一组五种 Fmoc 叠氮基氨基酸的可能性:β-叠氮基l-丙氨酸和d-丙氨酸、γ-叠氮基l-高丙氨酸、δ-叠氮基l-鸟氨酸和ω叠氮升-赖氨酸。我们研究了文献中描述的几种反应途径,提出了一些改进建议,并提出了几种合成高纯度化合物的替代途径。在这里,我们证明可以在一两周内以用户友好的成本制备多克数量的这些 Fmoc 叠氮基氨基酸。我们还将这些叠氮基氨基酸并入几种模型三肽中,我们观察到在与 2-(1 H-苯并三唑-1-基)-1,1,3,3-四甲基脲六氟磷酸盐/DIPEA。我们希望我们详细的合成方案能激励一些肽化学家在他们的实验室中制备这些 Fmoc 叠氮酸,并帮助他们避免叠氮肽合成过于庞大的成本。
Access to Enantioenriched α-Amino Esters via Rhodium-Catalyzed 1,4-Addition/Enantioselective Protonation
Conjugate addition of potassiumtrifluoro(organo)borates 2 to dehydroalanine derivatives 1, mediated by a chiral rhodium catalyst and in situ enantioselective protonation, afforded straightforward access to a variety of protected alpha-amino esters 3 with high yields and enantiomeric excesses up to 95%. Among the tested chiral ligands and proton sources, Binap, in combination with guaiacol (2-methoxyphenol)
Cu(OTf)<sub>2</sub>-Promoted 1,4-Addition of Alkyl Bromides to Dehydroalanine
作者:Jung-Ah Shin、Jiheon Kim、Hongsoo Lee、Sura Ha、Hee-Yoon Lee
DOI:10.1021/acs.joc.9b00369
日期:2019.4.5
Zn/Cu(OTf)2-mediated addition of alkylbromides to dehydroalanine (Dha) derivatives including dipeptides and tripeptides in good to high yields under an aqueous medium was developed. This protocol allows selective and biocompatible access to various amino acid units from Dha derivatives.
The asymmetric conjugateaddition of arylboronic acids to N-phthalimidodehydroalanine 1i catalyzed by Rh(I)/L1a enables the facile preparation of chiral functionalized phenylalanines. The reaction proceeds by a conjugateaddition and enantioselective protonation cascade, affording a rhodium enolate that undergoes re-face protonation. The reaction tolerates various arylboronic acids and can be used