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tert butanol/dichloromethane
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6 resultater
Comparison of solid dispersions produced by supercritical antisolvent and spray-freezing technologies.
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Oxeglitazar is a new orally administered poorly water soluble active substance used in the treatment of type II diabetes. The objective of this work was to improve its dissolution kinetics using supercritical antisolvent (SAS) and spray-freezing (SF) techniques. Oxeglitazar was formulated with
N-alkoxycarbonyl-glutamic and aspartic acids. Studies on the activation and cyclodehydration and side-reaction encountered in analysis of glutamic acid using Fmoc-chloride.
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N-Alkoxycarbonylaminodicarboxylic acids were reacted in dichloromethane with N-ethyl-N'-(dimethylaminopropyl)carbodiimide hydrochloride, and with methyl chloroformate in the presence of N-methylmorpholine. Removal of secondary products by washing the mixtures with aqueous solutions gave good yields
Determination of beta 2-receptor agonists in bovine urine and liver by gas chromatography-tandem mass spectrometry.
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A highly specific and sensitive method for the simultaneous detection of seven beta 2-receptor agonists in bovine liver homogenates and urine was developed. A 10-g amount of liver was homogenized and treated with Subtilisin A. The resulting enzymatic digest was extracted with tert.-butanol-ethyl
Preparation of N-9-fluorenylmethoxycarbonylamino acid chlorides from mixed anhydrides by the action of hydrogen chloride.
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N-9-Fluorenylmethoxycarbonyl-(Fmoc) amino-acid chlorides have been prepared by reaction of hydrogen chloride on purified mixed Fmoc-amino acid-monoalkyl carbonic acid anhydrides in dichloromethane. The products partially undergo subsequent conversion to the corresponding esters due to the presence
Development of a stereoselective practical synthetic route to indolmycin, a candidate anti-H. pylori agent.
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A stereoselective practical synthetic route to indolmycin is described. The route is composed of the regioselective coupling of indolyl magnesium halide with a trans-epoxy ester, diastereoselective oxazolone ring formation with guanidine and amine exchange reaction with methylamine. In the coupling
The DMAP-catalyzed acetylation of alcohols--a mechanistic study (DMAP = 4-(dimethylamino)pyridine).
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The acetylation of tert-butanol with acetic anhydride catalyzed by 4-(dimethylamino)pyridine (DMAP) has been studied at the Becke3 LYP/6-311 + G(d,p)//Becke3 LYP/6-31G(d) level of theory. Solvent effects have been estimated through single-point calculations with the PCM/UAHF solvation model. The
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