Design, Synthesis, and Functional Evaluation of Leukocyte Function Associated Antigen-1 Antagonists in Early and Late Stages of Cancer Development
摘要:
The integrin leukocyte function associated antigen 1 (LFA-1) binds the intercellular adhesion molecule 1 (ICAM-1) by its alpha(L)-chain inserted domain (I-domain). This interaction plays a key role in cancer and other diseases. We report the structure-based design, small-scale synthesis, and biological activity evaluation of a novel family of LFA-1 antagonists. The design led to the synthesis of a family of highly substituted homochiral pyrrolidines with antiproliferative and antimetastatic activity in a murine model of colon carcinoma, as well as potent antiadhesive properties in several cancer cell lines in the low micromolar range. NMR analysis of their binding to the isolated I-domain shows that they bind to the I-domain allosteric site (IDAS), the binding site of other allosteric LFA-1 inhibitors. These results provide evidence of the potential therapeutic value of a new set of LFA-1 inhibitors, whose further development is facilitated by a synthetic strategy that is versatile and fully stereocontrolled.
Stereoselective Synthesis of Cyclobutanes by Contraction of Pyrrolidines
作者:Chunngai Hui、Lukas Brieger、Carsten Strohmann、Andrey P. Antonchick
DOI:10.1021/jacs.1c10175
日期:2021.11.17
contractive synthesis of multisubstituted cyclobutanes containing multiple stereocenters from readily accessible pyrrolidines using iodonitrene chemistry. Mediated by a nitrogen extrusion process, the stereospecific synthesis of cyclobutanes involves a radical pathway. Unprecedented unsymmetrical spirocyclobutanes were prepared successfully, and a concise, formal synthesis of the cytotoxic natural product
在这里,我们报告了使用碘氮烯化学从容易获得的吡咯烷中收缩合成含有多个立体中心的多取代环丁烷。在氮挤压过程的介导下,环丁烷的立体定向合成涉及自由基途径。成功制备了史无前例的不对称螺环丁烷,并报道了细胞毒性天然产物哌拉硼烯 B 的简明、正式合成。
Catalytic Enantioselective Synthesis of Highly Functionalized Pentafluorosulfanylated Pyrrolidines
作者:Qun Zhao、Thi Minh Ha Vuong、Xing-Fen Bai、Xavier Pannecoucke、Li-Wen Xu、Jean-Philippe Bouillon、Philippe Jubault
DOI:10.1002/chem.201706167
日期:2018.4.11
The first catalytic asymmetric synthesis of highly functionalized pentafluorosulfanylated pyrrolidines is described. The method, based on a 1,3‐dipolar cycloaddition reaction of aryl and heteroaryl‐substituted glycine Schiff bases with pentafluorosulfanyl acrylic esters, gave access to a broad range of pyrrolidines bearing aryl, naphtyl, and heteroaryl groups. By using Xing‐Phos as a catalyst, the