Stereoselective Phenylselenoglycosylation of Glycals Bearing a Fused Carbonate Moiety toward the Synthesis of 2-Deoxy-β-galactosides and β-Mannosides
作者:Shuai Meng、Wenhe Zhong、Wang Yao、Zhongjun Li
DOI:10.1021/acs.orglett.0c00732
日期:2020.4.17
A phenylselenoglycosylation reaction of glycal derivatives mediated by diphenyl diselenide and phenyliodine(III) bis(trifluoroacetate) under mild conditions is described. Stereoselective glycosylation has been achieved by installing fused carbonate on those glycals. 3,4-O-Carbonate galactals and 2,3-O-carbonate 2-hydroxyglucals are converted into corresponding glycosides in good yields with excellent
AbstractHighly selective acylation of the phenolic hydroxy group can be achieved with (hydroxyalkyl)phenols carrying both alcoholic and phenolic hydroxyls by the use of vinyl carboxylates as acyl donors in the presence of rubidium fluoride. Graphical Abstract
Compounds With Mixed Pde-Inhibitory and Beta-Adrenergic Antagonist or Partial Agonist Activity For Treatment of Heart Failure
申请人:Taylor George Malcolm
公开号:US20080090827A1
公开(公告)日:2008-04-17
This invention provides compounds that possess inhibitory activity against β-adrenergic receptors and phosphodiesterase PDE, including phosphodiesterase 3 (PDE3). This invention further provides pharmaceutical compositions comprising such compounds; methods of using such compounds for treating cardiovascular disease, stroke, epilepsy, ophthalmic disorder or migraine; and methods of preparing pharmaceutical compositions and compounds that possess inhibitory activity against β-adrenergic receptors and PDE.
Twisted Amides as Selective Acylating Agents for Hydroxyl Groups under Neutral Conditions: Models for Activated Peptides during Enzymatic Acyl Transfer Reaction
The highly twisted amide 2 served as a selective acylating agent; for dials under neutral conditions. The reaction of primary-secondary dials with 2 led to the corresponding primary alkyl monopivalates. For dials containing alcoholic and phenolic hydroxyl groups, alcoholic hydroxyl groups were selectively acylated under neutral conditions, whereas, the opposite selectivity was observed under basic conditions, similar to the cases using acyl halides or acid anhydrides. Although 1 and 3 were unreactive to alcohols, 5-10 having substituent groups at C-4 were reactive to alcohols to give the corresponding acetates or benzoates.