一种新的和立体的策略被显影,以合成相应的模板9,得到的C-6同系物1-deoxyazasugars如1-脱氧d -galactohomonojirimycin(5),1-脱氧-4-羟甲基- d -glucohomonojirimycin(6) ,及其对映体。模板9还用于获得中性的非碱性伪乙内酰胺(8),C-4氨基和1-脱氧-homoojirimycin的甲基类似物,作为1-脱氧高纯糖的新类似物。发现化合物5是α-半乳糖苷酶的有效和特异性抑制剂(K i = 1.7μM)。类似的化合物6(Ki = 28μM), ent - 5( K i = 129μM)和ent - 6( K i = 12μM)表现出对β-葡萄糖苷酶的特异性抑制作用。
The sesquiterpene lactones cover a diverse and pharmacologically important diversity space. In particular, the electrophilic α-exo-methylene-γ-butyrolactone moiety that is preponderant in this natural product family has been shown to readily engage in covalent inhibition via conjugate addition of cysteine residues in target proteins. However, the synthetic accessibility of sesquiterpenes or related
Reaction of unsaturated phosphonate monoesters with bromo- and iodo(bis-collidine) hexafluorophosphates are reported to lead to the formation of five- to seven-membered phostones by exo mode cyclizations. When the chains of the unsaturated phosphonate monoesters are substituted in α of the double bond by a dioxolane group endo mode cyclizations are observed. These cyclizations give rise to the formation
Olefin cross-metathesis based approach for the first total synthesis of phomopsolidone B and total synthesis of phomopsolidone A
作者:Kasa Shiva Raju、Gowravaram Sabitha
DOI:10.1016/j.tetasy.2016.06.002
日期:2016.8
The first total synthesis of phomopsolidone B and the total synthesis of phomopsolidone A have been achieved based on an olefin cross-metathesis approach starting from L-(+)-diethyl tartrate. (C) 2016 Elsevier Ltd. All rights reserved.
A β-lactam-azasugar hybrid as a competitive potent galactosidase inhibitor
作者:Ganesh Pandey、Shrinivas G. Dumbre、M. Islam Khan、M. Shabab、Vedavati G. Puranik
DOI:10.1016/j.tetlet.2006.09.005
日期:2006.11
A beta-lactam-azasugar hybrid (polyhydroxylated carbacephem) has been designed and synthesized as a potent glycosidase inhibitor. (c) 2006 Elsevier Ltd. All rights reserved.
Pharmacophore Mapping in the Laulimalide Series: Total Synthesis of a Vinylogue for a Late-Stage Metathesis Diversification Strategy
作者:Paul A. Wender、Michael K. Hilinski、Philip R. Skaanderup、Nicolas G. Soldermann、Susan L. Mooberry
DOI:10.1021/ol061619u
日期:2006.8.1
An efficient synthesis of the macrocyclic core of laulimalide with a pendant vinyl group at C20 is described, allowing for late-stage introduction of various side chains through a selective and efficient cross metathesis diversification step. Representative analogues reported herein are the first to contain modifications to only the side chain dihydropyran of laulimalide and des-epoxy laulimalide. This step-economical strategy enables the rapid synthesis of new analogues using alkenes as an inexpensive, abundantly available diversification feedstock.