Two bis-C-aminoglycosyl arenes containing the angolosamine and the vancosamine moieties, which are potentially useful as the D-ring fragments of the pluramycin-type antibiotics, were efficiently synthesized by the O→C-glycoside rearrangement based strategy.
Two Axles Threaded Using a Single Template Site: Active Metal Template Macrobicyclic [3]Rotaxanes
作者:Stephen M. Goldup、David A. Leigh、Paul R. McGonigal、Vicki E. Ronaldson、Alexandra M. Z. Slawin
DOI:10.1021/ja9080716
日期:2010.1.13
to rotaxanes normally require at least n - 1 template sites to interlock n components. Here we describe the one-pot synthesis of [3]rotaxanes in which a single metal template site induces formation of axles through each cavity of a bicyclic macrocycle. Central to the approach is that a portion of the bicyclic molecule acts as a ligand for a transition metal ion that mediates covalent bond formation
Efficient and Selective Reduction Protocols of the 2,2-Dimethyl-1,3-benzodioxan-4-one Functional Group to Readily Provide Both Substituted Salicylaldehydes and 2-Hydroxybenzyl Alcohols
作者:Naval Bajwa、Michael P. Jennings
DOI:10.1021/jo0601664
日期:2006.4.1
Two complementary procedures have been developed that selectively allow for the synthesis of either substituted salicylaldehydes or the corresponding 2-hydroxylbenzyl alcohols upon treatment of the 2,2-dimethyl- 1,3-benzodioxan-4-one functional group with DIBAL-H or LAH, respectively.
Oxidative cyclization of alkenoic acids promoted by AgOAc
作者:Ulises A. Carrillo-Arcos、Jonathan Rojas-Ocampo、Susana Porcel
DOI:10.1039/c5dt03808a
日期:——
Alkenoic acids derived from salicylic acid analogues undergo an unexpected oxidative cyclization process triggered by AgOAc leading to 4H-benzo[d][1,3]dioxin-4-ones.
assembled by intermolecular [4 + 2] hetero-Diels–Alder cycloaddition between (−)-sabinene and o-quinone methide, which was generated from the corresponding o-hydroxybenzyl alcohol. After establishing the absolute configuration, the inhibitory activities of spirooliganones 1–8 against Coxsackie virus B3 were evaluated, and the primary structure–activity relationships were analyzed. Compound 3 was the most potent