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【结 构 式】

【分子编号】52105

【品名】(2R,3R)-3-hydroxy-2-isobutyl-4-methylpentanoic acid

【CA登记号】

【 分 子 式 】C10H20O3

【 分 子 量 】188.267

【元素组成】C 63.8% H 10.71% O 25.49%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(VI)

Catalytic hydrogenation of methyl isobutyrylacetate (I) in the presence of chiral ruthenium catalyst afforded the (S)-hydroxy ester (II). Subsequent alkylation of the lithium enolate of (II) with 3-bromo-2-methyl-1-propene (III) proceeded with diastereoselectivity, yielding (IV). The olefin double bond of (IV) was then hydrogenated over Pd/C to provide the saturated compound (V). After basic hydrolysis of the methyl ester group of (V), the resultant carboxylic acid (VI) was coupled to O-tetrahydropyranylhydroxylamine (VII) to furnish the tetrahydropyranyl-protected hydroxamate (VIII). Conversion of (VIII) into the corresponding mesylate, followed by cyclization under basic conditions, gave rise to the azetidinone (IX). Further azetidinone ring opening under conditions of basic hydrolysis generated the N-hydroxyaminoacid derivative (X). This was converted to the formamide (XI) upon treatment with formic acetic anhydride in pyridine.

1 Chan, J.H.; Bubacz, D.G.; Andersen, M.W.; McDougald, D.L.; Stanford, J.B.; Andrews, R.C.; Gaul, M.D.; Rabinowitz, M.H.; Musso, D.L.; Cowan, D.J.; Wiethe, R.W. (GlaxoSmithKline plc); Reverse hydroxamate derivs. as metalloprotease inhibitors. EP 1019386; JP 2001513767; WO 9838179 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 43331 methyl 4-methyl-3-oxopentanoate 42558-54-3 C7H12O3 详情 详情
(II) 52102 methyl (3S)-3-hydroxy-4-methylpentanoate C7H14O3 详情 详情
(III) 40015 3-bromo-2-methyl-1-propene 1458-98-6 C4H7Br 详情 详情
(IV) 52103 methyl (2R)-2-[(1R)-1-hydroxy-2-methylpropyl]-4-methyl-4-pentenoate C11H20O3 详情 详情
(V) 52104 methyl (2R,3R)-3-hydroxy-2-isobutyl-4-methylpentanoate C11H22O3 详情 详情
(VI) 52105 (2R,3R)-3-hydroxy-2-isobutyl-4-methylpentanoic acid C10H20O3 详情 详情
(VII) 52106 2-(aminooxy)tetrahydro-2H-pyran; O-tetrahydro-2H-pyran-2-ylhydroxylamine C5H11NO2 详情 详情
(VIII) 52107 (2R,3R)-3-hydroxy-2-isobutyl-4-methyl-N-(tetrahydro-2H-pyran-2-yloxy)pentanamide C15H29NO4 详情 详情
(IX) 52108 (3R,4S)-3-isobutyl-4-isopropyl-1-(tetrahydro-2H-pyran-2-yloxy)-2-azetidinone C15H27NO3 详情 详情
(X) 52109 (2R,3S)-2-isobutyl-4-methyl-3-[(tetrahydro-2H-pyran-2-yloxy)amino]pentanoic acid C15H29NO4 详情 详情
(XI) 52110 (2R,3S)-3-[formyl(tetrahydro-2H-pyran-2-yloxy)amino]-2-isobutyl-4-methylpentanoic acid C16H29NO5 详情 详情
Extended Information