Triphenylphosphine → 4-(1-Oxo-1,2,3,4-tetrahydro-pyrazino[1,2-a]indol-8-yloxy)-piperidine-1-carboxylic acid tert-butyl ester

HRID 2105331Notes

Reaction equation

[OH:1][C:2]1[CH:10]=[CH:9][C:8]2[N:7]3[CH2:11][CH2:12][NH:13][C:14](=[O:15])[C:6]3=[CH:5][C:4]=2[CH:3]=1.[C:16]([O:20][C:21]([N:23]1[CH2:28][CH2:27][CH:26](O)[CH2:25][CH2:24]1)=[O:22])([CH3:19])([CH3:18])[CH3:17].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OC(C)(C)C)=O)=NC(OC(C)(C)C)=O>O1CCCC1>[C:16]([O:20][C:21]([N:23]1[CH2:28][CH2:27][CH:26]([O:1][C:2]2[CH:10]=[CH:9][C:8]3[N:7]4[CH2:11][CH2:12][NH:13][C:14](=[O:15])[C:6]4=[CH:5][C:4]=3[CH:3]=2)[CH2:25][CH2:24]1)=[O:22])([CH3:19])([CH3:17])[CH3:18]

Participants

Conditions

Temperature: 0 °C

Procedure

To the solution of 0.5 g (2.5 mmol) 8-hydroxy-3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one (example 1, intermediate a)) in 10 mL tetrahydrofuran, 0.6 g (3.0 mmol) 1-(tert-butoxycarbonyl)-4-hydroxypiperidine and 0.78 g (3.0 mmol) triphenylphosphine were added. The solution was cooled to 0° C., 0.68 g (3.0 mmol) di-tert-butyl azodicarboxylate were added and the cooling bath was removed. After 18 hours the reaction mixture was evaporated and the residue was flash-chromatographed on silica gel with dichloromethane:methanol:ammonia (9:1:0.1 v/v) as eluant to give 0.46 g (49%) of the desired compound as a white solid.

Workup

customthe cooling bath was removed
customAfter 18 hours the reaction mixture was evaporated
customthe residue was flash-chromatographed on silica gel with dichloromethane:methanol:ammonia (9:1:0.1 v/v) as eluant

Sources & evidence

ORD record: ord-ab4b2bc064074b6e92126d3e3252f73e
Source dataset: uspto-grants-2009_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07579351B2

Reaction notes

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