Process of producing 8A- and 9A-azalide antibiotics
申请人:Merck & Co., Inc.
公开号:US05332807A1
公开(公告)日:1994-07-26
A process of producing 8a- and 9a- azalide compounds is disclosed, comprised of reacting an 8a- aza or 9a- aza azalide eastern fragment or a derivative thereof with a compound of the formula: X--A'--Y wherein X and Y are appropriate reactive groups and A' is a fragment or compound which forms the western portion of the azalide, and cyclizing this intermediate to form the target 8a- or 9a-azalide compound. Compounds of formula I, II and III as well as other azalides can be synthesized according to this process.
metabolite, australifungin possesses an α-diketone and a β-ketoaldehyde moiety on its trans-decalin backbone. Microwave-assisted intramolecularDiels–Alderreaction was used as a key strategy to establish the trans-decalin moiety. Further functionalization of the ring B sidechain installed the β-ketoaldehyde, one of the two unique functional groups along with the α-diketone.
作为一种真菌代谢物,澳曲芬净在其反式萘烷主链上具有一个 α-二酮和一个 β-酮醛部分。微波辅助分子内 Diels-Alder 反应被用作建立反式十氢化萘部分的关键策略。环 B 侧链的进一步官能化安装了 β-酮醛,这是与 α-二酮一起的两个独特官能团之一。
Synthesis of <scp>Anti‐Pancreatic</scp> Cancer Natural Product Majusculamide D and Analogues Reveals a Preliminary <scp>Structure‐Activity</scp> Relationships
The total synthesis of majusculamide D (1) was achieved from commercially available materials. In addition, we synthesized eight analogues including three stereoisomers of majusculamide D that differ in the fatty acid chain. Six analogues including a simplified analogue 29 exhibited significant nanomolar-level IC50 values against Panc-1 cells in MTT assays. A preliminary SAR analysis indicated that
majusculamide D ( 1 )的全合成是由市售材料实现的。此外,我们还合成了八种类似物,包括三种脂肪酸链不同的 majusculamide D 立体异构体。在 MTT 测定中,包括简化类似物29在内的六种类似物对 Panc-1 细胞表现出显着的纳摩尔水平 IC 50值。初步的SAR分析表明majusculamide D的C 10 和C 2− C 3 不饱和双键上的羟基对于维持对Panc-1细胞的高活性以及C 40-Me 和C 42-Me基团的定向至关重要是可以忍受的。
Tumor chemopreventive activity of 3- O -acylated (−)-epigallocatechins
In order to seek promising cancer chemopreventive agents, we assessed the antitumor promoting activities of 3-O-octanoyl or 3-O-(2-methyloctanoyl)-(-)-epigallocatechins, inhibiting markedly the activation of Epstein-Barr virus early antigen, in a two-stage mouse skin carcinogenesis assay. As a result, these derivatives inhibited a papilloma formation 1.3-1.6-fold more strongly than (-)-epigallocatechin gallate well established as anti-tumor promoter. (C) 2003 Elsevier Ltd. All rights reserved.