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【结 构 式】 
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【分子编号】23661 【品名】benzyl (2S)-2-[(2-bromoacetyl)amino]-4-methylpentanoate 【CA登记号】 |
【 分 子 式 】C15H20BrNO3 【 分 子 量 】342.23274 【元素组成】C 52.64% H 5.89% Br 23.35% N 4.09% O 14.03% |
合成路线1
该中间体在本合成路线中的序号：(III)Acylation of L-leucine benzyl ester (I) with bromoacetic acid (II) in the presence of DCC and DMAP gave bromoacetamide (III), which upon reaction with triphenyl phosphine was converted to phosphonium salt (IV). After treatment of (IV) with Et3N, the resulting ylide was condensed with N-Boc-L-leucine (V) to yield the acyl- phosphonate (VI). Acid deprotection of the N-Boc group of (VI) provided amine (VII), which was condensed with the depsipeptide (VIII) using EDC and HOBt yielding (IX). Removal of the N-Fmoc group from tetrapeptide (IX) was effected by treatment with piperidine in DMF, and the resulting amino compound was further condensed with protected L-asparagine (X) to furnish peptide (XI). After hydrogenolytic removal of the benzyl and carbobenzoxy groups of (XI), treatment with diphenyl phosphoryl azide and NaHCO3 produced the cyclic depsipeptide (XII).
| 【1】 Wasserman, H.H.; et al.; The chemistry of vicinal tricarbonyls: Total syntheses of elastase inhibitors YM-47141 and YM-47142. Helv Chim Acta 2000, 83, 9, 2607. |
| 【2】 Wasserman, H.H.; et al.; Total syntheses of depsipeptide elastase inhibitor. J Am Chem Soc 1999, 121, 6, 1401. |
| 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) | 22252 | Benzyl (2S)-2-amino-4-methylpentanoate; Benzyl (S)-leucinate | C13H19NO2 | 详情 | 详情 | |
| (II) | 23660 | 2-Bromoacetic acid | 79-08-3 | C2H3BrO2 | 详情 | 详情 |
| (III) | 23661 | benzyl (2S)-2-[(2-bromoacetyl)amino]-4-methylpentanoate | C15H20BrNO3 | 详情 | 详情 | |
| (IV) | 23662 | benzyl (2S)-4-methyl-2-[[2-(triphenylphosphoranyl)acetyl]amino]pentanoate | C33H36NO3P | 详情 | 详情 | |
| (V) | 23663 | (2S)-2-[(tert-butoxycarbonyl)amino]-4-methylpentanoic acid；N-Boc-L-leucine | C11H21NO4 | 详情 | 详情 | |
| (VI) | 23664 | benzyl (2S)-2-[[(4S)-4-[(tert-butoxycarbonyl)amino]-6-methyl-3-oxo-2-(triphenylphosphoranylidene)heptanoyl]amino]-4-methylpentanoate | C44H53N2O6P | 详情 | 详情 | |
| (VII) | 23665 | benzyl (2S)-2-[[(4S)-4-amino-6-methyl-3-oxo-2-(triphenylphosphoranylidene)heptanoyl]amino]-4-methylpentanoate | C39H45N2O4P | 详情 | 详情 | |
| (VIII) | 23666 | (2S,3S)-2-[(tert-butoxycarbonyl)amino]-3-[((2R)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]propanoyl)oxy]butyric acid | C27H32N2O8 | 详情 | 详情 | |
| (IX) | 23667 | benzyl (5R,8S,9S,12S,17S)-9-[(tert-butoxycarbonyl)amino]-1-(9H-fluoren-9-yl)-12,17-diisobutyl-5,8-dimethyl-3,6,10,13,15-pentaoxo-14-(triphenylphosphoranylidene)-2,7-dioxa-4,11,16-triazaoctadecan-18-oate | C66H75N4O11P | 详情 | 详情 | |
| (X) | 23668 | C13H16N2O5 | 详情 | 详情 | ||
| (XI) | 23669 | C64H79N6O13P | 详情 | 详情 | ||
| (XII) | 23670 | C49H65N6O10P | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(III)Acylation of L-leucine benzyl ester (I) with bromoacetic acid (II) in the presence of DCC and DMAP gave bromoacetamide (III), which upon reaction with triphenyl phosphine was converted to phosphonium salt (IV). After treatment of (IV) with Et3N, the resulting ylide was condensed with N-Boc-L-leucine (V) to yield the acyl- phosphonate (VI). Acid deprotection of the N-Boc group of (VI) provided amine (VII), which was condensed with the depsipeptide (VIII) using EDC and HOBt yielding (IX). Removal of the N-Fmoc group from tetrapeptide (IX) was effected by treatment with piperidine in DMF, and the resulting amino compound was further condensed with protected L-asparagine (X) to furnish peptide (XI). After hydrogenolytic removal of the benzyl and carbobenzoxy groups of (XI), treatment with diphenyl phosphoryl azide and NaHCO3 produced the cyclic depsipeptide (XII).
| 【1】 Wasserman, H.H.; et al.; The chemistry of vicinal tricarbonyls: Total syntheses of elastase inhibitors YM-47141 and YM-47142. Helv Chim Acta 2000, 83, 9, 2607. |
| 【2】 Wasserman, H.H.; et al.; Total syntheses of depsipeptide elastase inhibitor. J Am Chem Soc 1999, 121, 6, 1401. |
| 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) | 22252 | Benzyl (2S)-2-amino-4-methylpentanoate; Benzyl (S)-leucinate | C13H19NO2 | 详情 | 详情 | |
| (II) | 23660 | 2-Bromoacetic acid | 79-08-3 | C2H3BrO2 | 详情 | 详情 |
| (III) | 23661 | benzyl (2S)-2-[(2-bromoacetyl)amino]-4-methylpentanoate | C15H20BrNO3 | 详情 | 详情 | |
| (IV) | 23662 | benzyl (2S)-4-methyl-2-[[2-(triphenylphosphoranyl)acetyl]amino]pentanoate | C33H36NO3P | 详情 | 详情 | |
| (V) | 23663 | (2S)-2-[(tert-butoxycarbonyl)amino]-4-methylpentanoic acid；N-Boc-L-leucine | C11H21NO4 | 详情 | 详情 | |
| (VI) | 23664 | benzyl (2S)-2-[[(4S)-4-[(tert-butoxycarbonyl)amino]-6-methyl-3-oxo-2-(triphenylphosphoranylidene)heptanoyl]amino]-4-methylpentanoate | C44H53N2O6P | 详情 | 详情 | |
| (VII) | 23665 | benzyl (2S)-2-[[(4S)-4-amino-6-methyl-3-oxo-2-(triphenylphosphoranylidene)heptanoyl]amino]-4-methylpentanoate | C39H45N2O4P | 详情 | 详情 | |
| (VIII) | 23666 | (2S,3S)-2-[(tert-butoxycarbonyl)amino]-3-[((2R)-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]propanoyl)oxy]butyric acid | C27H32N2O8 | 详情 | 详情 | |
| (IX) | 23667 | benzyl (5R,8S,9S,12S,17S)-9-[(tert-butoxycarbonyl)amino]-1-(9H-fluoren-9-yl)-12,17-diisobutyl-5,8-dimethyl-3,6,10,13,15-pentaoxo-14-(triphenylphosphoranylidene)-2,7-dioxa-4,11,16-triazaoctadecan-18-oate | C66H75N4O11P | 详情 | 详情 | |
| (X) | 23668 | C13H16N2O5 | 详情 | 详情 | ||
| (XI) | 23669 | C64H79N6O13P | 详情 | 详情 | ||
| (XII) | 23670 | C49H65N6O10P | 详情 | 详情 |