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。
Gold(I)-Catalyzed Domino Cyclizations of Diynes for the Synthesis of Functionalized Cyclohexenone Derivatives. Total Synthesis of (−)-Gabosine H and (−)-6-<i>epi</i>-Gabosine H
作者:Bojan Vulovic、Dusan Kolarski、Filip Bihelovic、Radomir Matovic、Maja Gruden、Radomir N. Saicic
DOI:10.1021/acs.orglett.6b01898
日期:2016.8.5
position undergo gold(I)-catalyzed domino-cyclization which affords α-hydroxycyclohexenones. The described sequence can be applied on functionalized, highly oxygenated substrates, as examplified in the synthesis of (−)-gabosine H and its epimer.
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
A convergent total synthesis of resorcylic acid lactones zeaenol and cochliomycin A
作者:Rajesh Nasam、Srihari Pabbaraja
DOI:10.1016/j.tetlet.2022.153777
日期:2022.5
A convergent approach for the stereoselective total synthesis of zeaenol and cochliomycin A is reported. The key steps involved are alkyne generation using Ohira-Bestmann reagent onto sugar lactol, NaH mediated one-pot esterification and acetonide deprotection, Trost’s protocol of hydrosilylation followed by protodesilylation to get exclusively E-olefin from internal alkyne and ring closing metathesis
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.
Synthesis and evaluation of 1-deoxy-8-epi-castanospermine, 1-deoxy-8-hydroxymethyl castanospermine, and (6S,7S,8R,8aR)-8-amino-octahydroindolizine-6,7-diol
作者:Ganesh Pandey、Shrinivas G. Dumbre、Sujit Pal、M. Islam Khan、M. Shabab
DOI:10.1016/j.tet.2007.03.085
日期:2007.5
A short, versatile, and enantioselective synthesis of 1-deoxy-8-epi-castanospermine (5), 1-deoxy-8-hydroxymethyl castanospermine (6), and (6S,7S,8R,8aR)-8-amino-octahydroindolizine-6,7-diol (7) is achieved from a common template 12. The key step utilized is PET provoked amine radical cyclization of 11 to 12 in excellent diastereoselectivity. The exocyclic double bond at C-8 of the template is functionalized to obtain 5-7 as exclusive diastereomers. 1-Deoxy-8-epi-castanospermine exhibited inhibition of alpha- and beta-galactosidase and beta-glucosidase. Compounds 6 and 7 were found to be weak inhibitors of beta-glucosidase. (C) 2007 Elsevier Ltd. All rights reserved.