Experimental and theoretical studies of the [3,3]-sigmatropic rearrangement of prenyl azides
作者:Exequiel O. J. Porta、Margarita M. Vallejos、Andrea B. J. Bracca、Guillermo R. Labadie
DOI:10.1039/c7ra09759j
日期:——
[3,3]-Sigmatropic rearrangement of isoprenyl azides has been extensively investigated in an experimental and theoretical level. Prenylazides with different chain lengths and phenyl prenylazide have been synthesized. NMR analysis of each azide has been made to determine the equilibrium composition, showing the predominance of primary allyl azides over the tertiary ones and E over Z isomer, regardless
The synthesis of rare macrocyclic alkynediyl sulfides by a Cu‐catalyzed Csp−S cross‐coupling is presented. The catalytic protocol (Cu(MeCN)4PF6/dtbbpy) promotes macrocyclization of peptides, dipeptides and tripeptides at ambient temperature (14 examples, 23→73 % yields) via thiols and bromoalkynes, and is chemoselective with regards to terminal alkynes. Importantly, the underexplored alkynediyl sulfide
We developed a mild, metal-free practical method for late-stage dehydroxyazidation of structurally complex alcohols promoted by trifunctional hypervalent azido-iodine(III) reagents ABZ. The reactions proceeded via an SN2 pathway and showed excellent chemoselectivity and stereospecificity and gave the corresponding azides in high yields. The reaction mechanism was investigated by means of experiments
我们开发了一种温和、无金属的实用方法,用于由三官能高价叠氮碘 (III) 试剂 ABZ 促进的结构复杂醇的后期脱羟基叠氮化。该反应通过S N 2 途径进行,表现出优异的化学选择性和立体特异性,并以高收率得到相应的叠氮化物。通过实验和DFT计算研究了反应机理。
Ribosomal Synthesis of an Amphotericin-B Inspired Macrocycle
作者:Kohei Torikai、Hiroaki Suga
DOI:10.1021/ja508648s
日期:2014.12.17
report in vitro ribosomal synthesis of a natural product-like macrocyclic peptide, inspired by the structure of amphotericin B (AmB), an amphiphilic and membrane-interacting antifungal natural product. This AmB-inspired macrocyclic peptide (AmP), one side of which is composed of hydrophobic terpene, and the other side comprises a peptidic chain, was synthesized utilizing flexizyme-assisted in vitro translation
在这里,我们报告了一种天然产物样大环肽的体外核糖体合成,其灵感来自两性霉素 B (AmB),一种两亲性和膜相互作用的抗真菌天然产物。这种受 AmB 启发的大环肽 (AmP),一侧由疏水萜烯组成,另一侧包含肽链,是利用灵活酶辅助的体外翻译合成的,通过不寻常但成功的 D-半胱氨酸衍生物起始. 已建立的 AmP 合成方法适用于生成多样化的 AmP 文库以及体外展示格式, 有可能导致发现人工生物活性两亲性大环化合物。
Antitrypanosomal and antileishmanial activity of prenyl-1,2,3-triazoles
作者:Exequiel O. J. Porta、Sebastián N. Jäger、Isabel Nocito、Galina I. Lepesheva、Esteban C. Serra、Babu L. Tekwani、Guillermo R. Labadie
DOI:10.1039/c7md00008a
日期:——
A series of prenyl 1,2,3-triazoles were prepared from isoprenyl azides and different alkynes. Most of the compounds were active against T. cruzi and L. donovani.