Hydrochloric Acid → 1-tert-Butyl 18-(2,5-dioxopyrrolidin-1-yl) octadecanedioate

HRID 2361850Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2361850
[C:1]([O:5][C:6](=[O:26])[CH2:7][CH2:8][CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH2:18][CH2:19][CH2:20][CH2:21][CH2:22][C:23]([OH:25])=[O:24])([CH3:4])([CH3:3])[CH3:2].[B-](F)(F)(F)F.CN(C(O[N:40]1[C:45](=[O:46])[CH2:44][CH2:43][C:41]1=[O:42])=[N+](C)C)C.CCN(C(C)C)C(C)C.Cl>C1COCC1.C(#N)C>[O:42]=[C:41]1[CH2:43][CH2:44][C:45](=[O:46])[N:40]1[O:24][C:23](=[O:25])[CH2:22][CH2:21][CH2:20][CH2:19][CH2:18][CH2:17][CH2:16][CH2:15][CH2:14][CH2:13][CH2:12][CH2:11][CH2:10][CH2:9][CH2:8][CH2:7][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:26]

Komponenten

7

Edukt 4

HCID 313Hydrochloric AcidHCID 81531DiisopropylethylamineHCID 98575222-(2,5-Dioxopyrrolidin-1-yl)-1,1,3,3-tetramethylisouronium tetrafluoroborateHCID 2728247318-(Tert-butoxy)-18-oxooctadecanoic acid

Produkt 1

HCID 582492131-tert-Butyl 18-(2,5-dioxopyrrolidin-1-yl) octadecanedioate

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6342AcetonitrileLösungsmittelHCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

Octadecanedioic acid mono-tert-butyl ester (4.2 g, 0.011 mol) was dissolved in THF (20 mL), TSTU (4 g, 0.013 mol) in acetonitrile (20 mL) was added and pH of the solution was adjusted to 8 with dropwise addition of DIPEA. The mixture was stirred at RT for 4 h, then acidified with HCl (2M) to pH 3 and evaporated in vacuo. The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M). The organic layer was dried (MgSO4), filtered and evaporated to dryness in vacuo. This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification. LC-MS (electrospray): m/z=468 (M+1) and 412 (M+1-tBu).

Aufarbeitung

  1. customevaporated in vacuo
  2. customThe residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M)
  3. dry with materialThe organic layer was dried (MgSO4)
  4. filtrationfiltered
  5. customevaporated to dryness in vacuo
  6. customThis afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification

Quellen und Nachweise

ORD-Eintrag
ord-fc56045d271a437093c7af526f0f86b2
Quelldatensatz
uspto-grants-2014_04
Patentnummer
US08691759B2

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