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【结 构 式】

【分子编号】20284

【品名】(2S,3S)-5-(benzyloxy)-2-ethyl-N-methoxy-3-(phenylsulfanyl)pentanamide

【CA登记号】

【 分 子 式 】C21H27NO3S

【 分 子 量 】373.51632

【元素组成】C 67.53% H 7.29% N 3.75% O 12.85% S 8.58%

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:(XIII)

A new and stereoselective synthesis of (3R-trans)-3-ethyl-1-(tert-butyldimethylsilyl)-4-[2-(tert-butyldimethylsilyloxy)ethyl]azetidin-2-one (XVII), a key intermediate in the synthesis of PS-5 has been developed: The oxidation of 3-benzyloxy-1-propanol (I) with oxalyl chloride in DMSO gives the corresponding aldehyde (II), which is condensed with the phosphonate (III) by means of NaH yielding a mixture of the (Z)- and (E)-isomers of 5-benzyloxy-2-ethyl-2-pentenoic acid ethyl ester (IV) and (V). The undesired (Z)-isomer (IV) is isomerized by treating the mixture with diphenyldisulfide in refluxing THF. The hydrolysis of (V) with LiOH in THF/methanol/water gives the expected free acid (VI), which is treated with SOCl2 in refluxing benzene to afford the acid chloride (VII). The condensation of (VII) with the chiral oxazolidinone (VIII) by means of butyllithium in THF gives the acylated compound (IX), which is treated with benzenethiol and butyllithium in THF to give the addition compound (X) that is purified by medium pressure column chromatography to eliminate the undesired diastereomer. The elimination of the oxazolidinone group of (X) by reaction with trimethylaluminum, benzylthiol and butyllithium in THF yields the thioester (XI), which is treated with silver trfluoroacetate and water to afford the corresponding free acid (XII). The reaction of (XII) with methoxyamine and 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide (EDPC) in water affords the methoxyamide (XIII), which is methylated by means of methyl iodide and silver perchlorate to give the sulfonium salt (XIV). The cyclization of (XIV) by means of K2CO3 yields the azetidinone (XV), which is debenzylated by means of calcium in liquid ammonia affording (3R-trans)-3-ethyl-4-(2-hydrxyethyl)azetidin-2-one (XVI). Finally, this compound is silylated with tert-butyldimethylsilyl (TBDMS) trifluoromethanesulfonate affording (3R-trans)-3-ethyl-1-(tert-butyldimethylsilyl)-4-[2-(tert-butyldimethylsilyloxy)ethyl]azetidin-2-one (XVII), the desired target key intermediate in the synthesis of PS-5.

1 Fujiwara,Y.; Ninomiya, I.; Miyata, O.; Naito, T.; Efficient stereoselective route to beta-lactams and their application to the stereoselective synthesis of a key intermediate for carbapenem antibiotic (+)-PS-5. J Chem Soc - Perkins Trans I 1998, 14, 14, 2167.
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) 14687 3-(benzyloxy)-1-propanol; 3-(Benzyloxy)propanol 4799-68-2 C10H14O2 详情 详情
(II) 14688 3-(benzyloxy)propanal C10H12O2 详情 详情
(IV) 20274 ethyl 2-(diethoxyphosphoryl)butanoate 17145-91-4 C10H21O5P 详情 详情
(V) 20275 ethyl (Z)-5-(benzyloxy)-2-ethyl-2-pentenoate C16H22O3 详情 详情
(VI) 20277 (E)-5-(benzyloxy)-2-ethyl-2-pentenoic acid C14H18O3 详情 详情
(VII) 20278 (E)-5-(benzyloxy)-2-ethyl-2-pentenoyl chloride C14H17ClO2 详情 详情
(VIII) 12867 (4S)-4-Isopropyl-1,3-oxazolidin-2-one; (R)-4-Isopropyl-2-oxazolidinone 17016-83-0 C6H11NO2 详情 详情
(IX) 20280 (4S)-3-[(E)-5-(benzyloxy)-2-ethyl-2-pentenoyl]-4-isopropyl-1,3-oxazolidin-2-one C20H27NO4 详情 详情
(X) 20281 (4S)-3-[(2S,3S)-5-(benzyloxy)-2-ethyl-3-(phenylsulfanyl)pentanoyl]-4-isopropyl-1,3-oxazolidin-2-one C26H33NO4S 详情 详情
(XI) 20282 S-benzyl (2R,3S)-5-(benzyloxy)-2-ethyl-3-(phenylsulfanyl)pentanethioate C27H30O2S2 详情 详情
(XII) 20283 (2S,3S)-5-(benzyloxy)-2-ethyl-3-(phenylsulfanyl)pentanoic acid C20H24O3S 详情 详情
(XIII) 20284 (2S,3S)-5-(benzyloxy)-2-ethyl-N-methoxy-3-(phenylsulfanyl)pentanamide C21H27NO3S 详情 详情
(XIV) 20285 [(1S,2S)-1-[2-(benzyloxy)ethyl]-2-[(methoxyamino)carbonyl]butyl](methyl)phenylsulfonium iodide C22H30INO3S 详情 详情
(XV) 20286 (3R,4R)-4-[2-(benzyloxy)ethyl]-3-ethyl-1-methoxy-2-azetidinone C15H21NO3 详情 详情
(XVI) 20287 (3R,4R)-3-ethyl-4-(2-hydroxyethyl)-2-azetidinone C7H13NO2 详情 详情
(XVII) 20051 (3R,4R)-1-[tert-butyl(dimethyl)silyl]-4-(2-[[tert-butyl(dimethyl)silyl]oxy]ethyl)-3-ethyl-2-azetidinone C19H41NO2Si2 详情 详情
Extended Information