Phthalylglycine aldehyde → tert-butyl(2S)-2-{[2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]amino}-3,3-dimethylbutanoate

HRID 1174296Notes

Reaction equation

[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[CH2:12][CH:13]=O.Cl.[C:16]([O:20][C:21](=[O:28])[C@H:22]([C:24]([CH3:27])([CH3:26])[CH3:25])[NH2:23])([CH3:19])([CH3:18])[CH3:17].[Na]>O1CCCC1.C(OCC)(=O)C>[O:11]=[C:4]1[C:5]2[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=2)[C:2](=[O:1])[N:3]1[CH2:12][CH2:13][NH:23][C@H:22]([C:21]([O:20][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:28])[C:24]([CH3:27])([CH3:25])[CH3:26]

Participants

Conditions

Temperature: 20 °C

Procedure

A solution of the product of Example 111-1 (46.5 g, 246.0 mmol) in tetrahydrofuran (900 mL) was treated with L-tert-leucine-t-butyl ester hydrochloride salt (66.1 g, 295.2 mmol, 1.2 equivalents) stirred at 20° C. for 2 hours, treated with sodium triacetoxyborohydrodride (78.2 g, 369.0 mmol, 1.5 equivalents) portionwise over 5 minutes (slightly exothermic), stirred at 20° C. for 2 hours, diluted with ethyl acetate (1 L) and washed with water (1 L). The organic layer was washed with water (1 L), 10% NaHCO3 (2×1 L) and brine (1 L). The organic layer was dried over MgSO4, filtered, and concentrated to afford the title compound (87 g, 98.2% yield). 1H NMR (CDCl3): δ 7.82 (m, 2 H), 7.70 (m, 2 H), 3.77 (t, 2 H), 2.92 (m, 1 H), 2.73(s, 1H), 2.68(m, 1H), 1.44(s, 9H), 0.86(s, 9H).

Workup

stirringstirred at 20° C. for 2 hours
washwashed with water (1 L)
washThe organic layer was washed with water (1 L), 10% NaHCO3 (2×1 L) and brine (1 L)
dry with materialThe organic layer was dried over MgSO4
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-2da1368726b641a58544500fd8f1c671
Source dataset: uspto-grants-2010_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07834043B2

Reaction notes

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