(+)-Usnic acid enamines with remarkable cicatrizing properties
摘要:
Wound healing is a significant concern in many pathologies (post-surgeries, burns, scars) and the search for new chemical entities is advisable. The lichen compound (+)-usnic acid (1) has found application in dermatological and cosmetic preparations, due to its bacteriostatic and antioxidant activities. The compound has also been shown to stimulate the wound closure of keratinocyte monolayers at subtoxic doses. Here we describe the design and synthesis of usnic acid enamines (compounds 2-11), obtained through nucleophilic attack of amino acids or decarboxyamino acids at the acyl carbonyl of the enolized 1,3 diketone. The wound repair properties of these derivatives were evaluated using in vitro and in vivo assays: Compounds 8 and 9 combine low cytotoxicity with high wound healing performance, suggesting their possible use in wound healing-promoting or antiage skin preparations. (C) 2013 Elsevier Ltd. All rights reserved.
Pd-PEPPSI-IPent<sup>An</sup> Promoted Deactivated Amination of Aryl Chlorides with Amines under Aerobic Conditions
作者:Fei-Dong Huang、Chang Xu、Dong-Dong Lu、Dong-Sheng Shen、Tian Li、Feng-Shou Liu
DOI:10.1021/acs.joc.8b01205
日期:2018.8.17
We report herein a highly efficient Pd-catalyzed amination by “bulky-yet-flexible” Pd-PEPPSI-IPentAn complexes. The relationship between the N-heterocyclic carbenes (NHCs) structure and catalytic properties was discussed. Sterically hindered (hetero)arylchlorides and a variety of aliphatic and aromatic amines can be applied in this cross-coupling, which smoothly proceeded to provide desired products
我们在此报告了一种由“大体积但还灵活”的Pd-PEPPSI-IPent An复合物进行的高效Pd催化胺化反应。讨论了N-杂环卡宾(NHCs)结构与催化性能之间的关系。可以在该交叉偶联中应用立体受阻的(杂)芳基氯化物以及各种脂肪族和芳香族胺,它们可以顺利进行以提供所需的产物。操作简单的协议强调了在不排除空气和水分的情况下,在温和条件下可快速获得C Ar -N键的形成。
An improved process for the synthesis of DMTMM-based coupling reagents
作者:Steven A. Raw
DOI:10.1016/j.tetlet.2008.12.047
日期:2009.2
A simple, robust and high-yielding process for the preparation of 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium tetrafluoroborate (DMTMM BF4) and hexafluorophosphate (DMTMM PF6) has been developed, which avoids the use of expensive or unusual reagents.
An efficient synthetic method for the pemetrexeddisodium has been developed using methyl 4‐iodobenzoate and 3‐buten‐1‐ol as starting materials via six steps. The developed process avoided some tedious workup procedures and unfriendly reagents compared with the reported synthetic routes. In addition, two impurities generated in the process were isolated and characterized by 1H NMR, 13C NMR, and HRMS
已经开发了一种高效的培美曲塞二钠合成方法,该方法以4-碘苯甲酸甲酯和3-丁烯-1-醇为原料,经过六个步骤。与报道的合成路线相比,开发的过程避免了一些繁琐的后处理程序和不友好的试剂。另外,分离出该方法中产生的两种杂质,并通过1 H NMR,13 C NMR和HRMS进行表征。还讨论了这两种杂质的机理,并且可以通过适当的后处理程序轻松去除杂质。培美曲塞二钠的总产率从12.8%(文献)提高到34.9%。因此,这种经济高效,环保且高产的工艺更适合于培美曲塞二钠的大规模生产。
METHODS AND COMPOUNDS FOR PRODUCING DIPEPTIDYL PEPTIDASE IV INHIBITORS AND INTERMEDIATES THEREOF
申请人:Vu Truc Chi
公开号:US20090018311A1
公开(公告)日:2009-01-15
Methods and compounds for production of cyclopropyl-fused pyrrolidine-based inhibitors of dipeptidyl peptidase IV are provided.
Process For Preparing Dipeptidyl Peptidase IV Inhibitors And Intermediates Therefor
申请人:Politino Michael
公开号:US20120276600A1
公开(公告)日:2012-11-01
A process for production of cyclopropyl-fused pyrrolidine-based inhibitors of dipeptidyl peptidase IV is provided which employs a BOC-protected amine of the structure
prepared by subjecting an acid of the structure
to reduce amination by treating the acid with ammonium formate, nicotinamide adenine dinucleotide, dithiothreitol and partially purified phenylalanine dehydrogenase/formate dehydrogenase enzyme concentrate (PDH/FDH) and without isolating treating the resulting amine of the structure 2
with di-tert-butyl dicarbonate to form the BOC-protected amine