Increasing the affinity of calstabin-2 for the cardiac calcium channel RyR2 and thereby stabilizing the channel in the closed state has recently been identified as novel mechanism for treating heart failure, particularly ventricular arrhythmias. JTV-519, a 1,4-benzothiazepine derivative, has been shown to stabilize the calstabin2/RyR2 complex. Novel derivatives of JTV-519 that may be useful in treatment or prevention of heart failure, atrial fibrillation, or exercise-induced cardiac arrhythmias are provided. Synthetic methodology and intermediates in the synthesis of the inventive JTV-519 derivatives are also described.
Superelectrophilic Activation of Crotonic/Methacrylic Acids: Direct Access to Thiochroman-4-ones from Benzenethiols by Microwave-Assisted One-Pot Alkylation/Cyclic Acylation
作者:Habiba Vaghoo、G. K. Surya Prakash、Arjun Narayanan、Rohit Choudhary、Farzaneh Paknia、Thomas Mathew、George A. Olah
DOI:10.1021/acs.orglett.5b03172
日期:2015.12.18
efficient microwave-assisted protocol for the synthesis of 2-/3-methylthiochroman-4-ones by superacid-catalyzed alkylation followed by cyclic acylation (cyclization via intramolecular acylation) is described. Using easily accessible benzenethiols and crotonic acid/methacrylic acid with triflic acid (as catalyst of choice for needed optimal acidity), the reaction was tuned toward the formation of the cyclized
The potential of Song’s chiral oligoethylene glycols (oligoEGs) as catalysts was explored in the enantioselective protonation of trimethylsilyl enolethers in combination with alkali metal fluoride (KF and CsF) and in the presence of a proton source. Highly enantioselective protonations of various silylenolethers of α-substituted tetralones were achieved, producing chiral α-substituted tetralones