1,1-Dioxonaphtho[1,2-<i>b</i>]thiophene-2-methyloxycarbonyl (α-Nsmoc) and 3,3-Dioxonaphtho[2,1-<i>b</i>]thiophene-2-methyloxycarbonyl (β-Nsmoc) Amino-Protecting Groups
作者:Louis A. Carpino、Adel Ali Abdel-Maksoud、Dumitru Ionescu、E. M. E. Mansour、Mohamed A. Zewail
DOI:10.1021/jo062397g
日期:2007.3.1
mechanistically similar to that previously established for the Bsmoc derivative in that the reaction is initiated by Michael addition to the β-carbon atom of the α,β-unsaturatedsulfone system. Application of α- and β-Nsmoc amino acids to the solid-phase synthesis of two model peptides was examined. An advantage of the α-Nsmoc system over the long-known Bsmoc system proved to be the milder conditions needed for
在Bsmoc相关的,基于萘噻吩砜基的氨基保护基的三个理论上可能的替代基团中,最易获得的两个衍生物α-和β-Nsmoc类似物已作为Bsmoc残基的替代品进行了研究。油性受保护的氨基酸或氨基酸氟化物。所有的萘系统均提供易于处理的固体氨基酸衍生物。用作引入α-Nsmoc保护基的关键试剂的中间体砜醇11很容易由α-四氢萘酮制备(方案1)。对应的β-类似物17类似地,在小规模上进行制备,但由于β-四氢萘酮的成本高,因此将罗丹宁与α-萘醛反应的替代途径用于大规模工作(方案2)。所有蛋白原氨基酸都转化为它们的α-和β-Nsmoc衍生物。脱保护研究表明,哌啶对脱保护的反应性依次为α-Nsmoc> Bsmoc>β-Nsmoc。1个1 H NMR实验表明,两个新系统的解封在机理上与先前为Bsmoc衍生物建立的解封在机理上相似,因为该反应是通过将迈克尔加成到α,β-不饱和砜系统的β-碳原子上而引发的。研究了α-
Pyrimido compounds having antiproliferative activity
申请人:——
公开号:US20040038995A1
公开(公告)日:2004-02-26
Disclosed are novel pyrimido compounds that are selective inhibitors of both KDR an FGFR kinases and are selective against LCK. These compounds and their pharmaceutically acceptable salts are anti-proliferative agents useful in the treatment or control of solid tumors, in particular breast, colon, lung and prostate tumors. Also disclosed are pharmaceutical compositions containing these compounds and methods of treating cancer.
Z or Fmocaminoacidfluorides have been prepared from the protected aminoacids and cyanuric fluoride, and have been tested both in the condensation with simple aminoacid esters and in Solid Phase PeptideSynthesis.
A Convenient, One-Pot Procedure for the Preparation of Acyl and Sulfonyl Fluorides Using Cl3CCN, Ph3P, and TBAF(t-BuOH)4
作者:Doo Jang、Joong-Gon Kim
DOI:10.1055/s-0030-1259051
日期:2010.12
Various carboxylic acids were converted into acyl fluorides in excellent yields by treatment with trichloroacetonitrile, triphenylphosphine, and TBAF(t-BuOH) 4 at room temperature. The reaction was applicable to the preparation of acid-sensitive amino acid fluorides without deprotection or rearrangement.
Improved Total Synthesis of Tubulysins and Design, Synthesis, and Biological Evaluation of New Tubulysins with Highly Potent Cytotoxicities against Cancer Cells as Potential Payloads for Antibody–Drug Conjugates
作者:K. C. Nicolaou、Rohan D. Erande、Jun Yin、Dionisios Vourloumis、Monette Aujay、Joseph Sandoval、Stefan Munneke、Julia Gavrilyuk
DOI:10.1021/jacs.7b12692
日期:2018.3.14
streamlined total syntheses of natural tubulysins such as V (Tb45) and U (Tb46) and pretubulysin D (PTb-D43), and their application to the synthesis of designedtubulysinanalogues (Tb44, PTb-D42, PTb-D47-PTb-D49, and Tb50-Tb120), are described. Cytotoxicity evaluation of the synthesized compounds against certain cancer cell lines revealed a number of novel analogues with exceptional potencies [e.g., Tb111:
V (Tb45) 和 U (Tb46) 和 pretubulysin D (PTb-D43) 等天然微管溶素的改进、简化的全合成,以及它们在合成设计的微管溶素类似物(Tb44、PTb-D42、PTb-D47-PTb)中的应用-D49 和 Tb50-Tb120),进行了描述。合成化合物对某些癌细胞系的细胞毒性评估揭示了许多具有特殊效力的新型类似物[例如,Tb111:IC50 = 40 pM 对 MES SA(子宫肉瘤)细胞系;针对 HEK 293T(人胚胎肾癌)细胞系的 IC50 = 6 pM;和 IC50 = 1.54 nM,对 MES SA DX(具有明显多重耐药性的 MES SA)细胞系]。这些研究产生了一组有价值的构效关系,为进一步的分子设计、合成和生物学评价研究提供指导。