Acetic Acid → (S)-4-[(S)-3-((S)-4-Hydroxy-6-aza-spiro[2.5]oct-6-yl)-1-hydroxymethyl-propyl]-2-methyl-3-oxo-piperazine-1-carboxylic acid benzyl ester

HRID 655550Notes

Reaction equation

CO[C:3](=[O:20])[C@@H:4]([N:6]([C:10]([O:12][CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:11])[CH2:7][CH:8]=O)[CH3:5].[NH2:21][C@H:22]([CH2:34][OH:35])[CH2:23][CH2:24][N:25]1[CH2:32][CH2:31][C:28]2([CH2:30][CH2:29]2)[C@H:27]([OH:33])[CH2:26]1.[B-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+].C(O)(=O)C>ClCCl>[CH2:13]([O:12][C:10]([N:6]1[CH2:7][CH2:8][N:21]([C@H:22]([CH2:34][OH:35])[CH2:23][CH2:24][N:25]2[CH2:32][CH2:31][C:28]3([CH2:30][CH2:29]3)[C@H:27]([OH:33])[CH2:26]2)[C:3](=[O:20])[C@@H:4]1[CH3:5])=[O:11])[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1

Participants

Conditions

Temperature: 40 °C

Procedure

A solution of (S)-2-[benzyloxycarbonyl-(2-oxo-ethyl)-amino]-propionic acid methyl ester (intermediate 27C, 2.35 g, 8.42 mmol) in dichloromethane (15 mL) was added at room temperature to a suspension of (S)-6-((S)-3-amino-4-hydroxy-butyl)-6-aza-spiro[2.5]octan-4-ol (1.81 g, 8.42 mmol), sodium triacetoxyborohyride (2.21 g, 1.01 mmol) and acetic acid (1.01 g, 16.8 mmol) in dichloromethane (15 mL). The reaction mixture was heated at 40° C. for 72 h, then partitioned between 1 M aq. sodium carbonate solution and ethyl acetate. The organic layer was washed with brine, dried (MgSO4), and evaporated. Chromatography (SiO2; dichloromethane→dichloromethane/methanol/25% aq. ammonia solution 90:10:0.25) produced the title compound (2.18 g, 58%). White foam, MS (ISP)=446.2 (M+H)+.

Workup

custompartitioned between 1 M aq. sodium carbonate solution and ethyl acetate
washThe organic layer was washed with brine
dry with materialdried (MgSO4)
customevaporated

Sources & evidence

ORD record: ord-0287fe4e2eb34743a10299831bdce0d6
Source dataset: uspto-grants-2011_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08071586B2

Reaction notes

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