Triphenylphosphine → methyl (2R)-(4-{2-[(tert-butoxycarbonyl)amino]ethoxy}phenyl){[(9H-fluoren-9-ylmethoxy)carbonyl]-amino}ethanoate

HRID 1976439Notes

Reaction equation

HRID 1976439 reaction equation
C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[OH:20][CH2:21][CH2:22][NH:23][C:24](=[O:30])[O:25][C:26]([CH3:29])([CH3:28])[CH3:27].[CH:31]1[C:43]2[CH:42]([CH2:44][O:45][C:46]([NH:48][C@H:49]([C:54]3[CH:59]=[CH:58][C:57](O)=[CH:56][CH:55]=3)[C:50]([O:52][CH3:53])=[O:51])=[O:47])[C:41]3[C:36](=[CH:37][CH:38]=[CH:39][CH:40]=3)[C:35]=2[CH:34]=[CH:33][CH:32]=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1>[C:26]([O:25][C:24]([NH:23][CH2:22][CH2:21][O:20][C:57]1[CH:58]=[CH:59][C:54]([C@@H:49]([NH:48][C:46]([O:45][CH2:44][CH:42]2[C:43]3[CH:31]=[CH:32][CH:33]=[CH:34][C:35]=3[C:36]3[C:41]2=[CH:40][CH:39]=[CH:38][CH:37]=3)=[O:47])[C:50]([O:52][CH3:53])=[O:51])=[CH:55][CH:56]=1)=[O:30])([CH3:27])([CH3:29])[CH3:28]

Participants

6

Reactant 4

HCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 2733206tert-butyl N-(2-hydroxyethyl)carbamateHCID 86590203methyl (2R)-2-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-(4-hydroxyphenyl)acetate

Product 1

HCID 86587124methyl (2R)-(4-{2-[(tert-butoxycarbonyl)amino]ethoxy}phenyl){[(9H-fluoren-9-ylmethoxy)carbonyl]-amino}ethanoateYield 59.4%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 0.465 g (1.77 mmol) of triphenylphosphine in 10 mL of THF was added 0.286 g (1.77 mmol) of tert-butyl N-(2-hydroxyethyl)-carbamate followed by 0.476 g (1.18 mmol) of methyl (2R)-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}(4-hydroxyphenyl)ethanoate and 0.279 mL (1.77 mmol) of diethyl azodicarboxylate. The reaction was stirred overnight at room temperature and then concentrated in vacuo. The residue was chromatographed on silica gel eluting with ethyl acetate/hexanes (1:3) to give 0.383 g of methyl (2R)-(4-{2-[(tert-butoxycarbonyl)amino]ethoxy}phenyl){[(9H-fluoren-9-ylmethoxy)carbonyl]amino}ethanoate as a white solid. Electrospray Mass Spec 547.2 (M+)+

Workup

  1. concentrationconcentrated in vacuo
  2. customThe residue was chromatographed on silica gel eluting with ethyl acetate/hexanes (1:3)

Sources & evidence

ORD record
ord-70aa0570bd774d609df56920faeccce2
Source dataset
uspto-grants-2001_05
Patent number
US06225311B1

Reaction notes

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