185815-59-2, 4-Isobutyldihydro-2H-pyran-2,6(3H)-dione is a Tetrahydropyrans compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated,185815-59-2
Example 5: Preparation of CSRVS-methyl-S-^-oxo^irdRVl-phenylethyllammolethyl) hexanoic acid compound (24); [0079] A three-necked flask equipped with an addition funnel, thermometer pocket, drying tube and a mechanical stirrer, was charged with methylene chloride (100 ml), (R)-(+)- phenylethylamine (53.38 g, 0.44 mole) and 4-dimethylaminopyridine (0.18 g, 0.00147 mole). The mixture was cooled to a temperature of 0-5C, followed by addition of a solution of 3-isobutyl glutaric anhydride (25 g, 0.147 mole) in methylene chloride (25 ml), over a period of 15-20 minutes, and stirring for additional 1.5-2 hours, at a temperature of 0-5C. The mixture was then extracted with 2.5-3 percent aqueous solution OfNaHCO3 solution (500 ml), and diluted with water (1000 ml) followed by washing the aqueous phase with toluene (1 x 100 ml and 1 x 50 ml). The pH of the aqueous phase was adjusted to 2-2.5 by adding a 1- 12N solution Of hydrochloric acid. The aqueous phase was further extracted with ethyl acetate (1 x 150 ml and 1 x 50 ml), followed by drying the combined ethyl acetates extracts over anhydrous sodium sulfate, and stripping off the solvents, to obtain a residue. The residue was crystallized from ethyl acetate and toluene mixture to get 26.2 g (61.3 percent yield) of a white solid of (3R)-5-methyl-3-(2-oxo-2-{[(lR)-l- phenylethyl]amino}ethyl)hexanoic acid with an optical purity of 99.41 percent, as measured by chiral HPLC.
As the paragraph descriping shows that 185815-59-2 is playing an increasingly important role.
Reference£º
Patent; TEVA PHARMACEUTICAL INDUSTRIES LTD.; TEVA PHARMACEUTICALS USA, INC.; WO2007/35789; (2007); A1;,
Tetrahydropyran – Wikipedia
Tetrahydropyran – an overview | ScienceDirect Topics