Formic Acid → (2R,4S)-4-Formyloxy-2-{4-[2-(4-nitrobenzyloxycarbonyl)oxyethyl]-1-piperazinylcarbonyl}-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

HRID 727681Notes

Reaction equation

HRID 727681 reaction equation
N(C(OCC)=O)=N[C:3](OCC)=[O:4].[OH:13][C@H:14]1[CH2:18][N:17]([C:19]([O:21][CH2:22][C:23]2[CH:28]=[CH:27][C:26]([N+:29]([O-:31])=[O:30])=[CH:25][CH:24]=2)=[O:20])[C@@H:16]([C:32]([N:34]2[CH2:39][CH2:38][N:37]([CH2:40][CH2:41][O:42][C:43]([O:45][CH2:46][C:47]3[CH:52]=[CH:51][C:50]([N+:53]([O-:55])=[O:54])=[CH:49][CH:48]=3)=[O:44])[CH2:36][CH2:35]2)=[O:33])[CH2:15]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(O)=O>O1CCCC1>[CH:3]([O:13][C@@H:14]1[CH2:18][N:17]([C:19]([O:21][CH2:22][C:23]2[CH:24]=[CH:25][C:26]([N+:29]([O-:31])=[O:30])=[CH:27][CH:28]=2)=[O:20])[C@@H:16]([C:32]([N:34]2[CH2:39][CH2:38][N:37]([CH2:40][CH2:41][O:42][C:43]([O:45][CH2:46][C:47]3[CH:52]=[CH:51][C:50]([N+:53]([O-:55])=[O:54])=[CH:49][CH:48]=3)=[O:44])[CH2:36][CH2:35]2)=[O:33])[CH2:15]1)=[O:4]

Participants

6

Reactant 4

HCID 284Formic AcidHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 86752007(2R,4R)-4-Hydroxy-2-{4-[2-(4-nitrobenzyloxycarbonyl)oxyethyl]-1-piperazinylcarbonyl}-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

Product 1

HCID 86752008(2R,4S)-4-Formyloxy-2-{4-[2-(4-nitrobenzyloxycarbonyl)oxyethyl]-1-piperazinylcarbonyl}-1-(4-nitrobenzyloxycarbonyl)pyrrolidineYield 45.2%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of 1.31 g of diethyl azodicarboxylate in 5 ml of tetrahydrofuran was added dropwise, whilst ice-cooling, to a solution of 3.0 g of (2R,4R)-4-hydroxy-2-{4-[2-(4-nitrobenzyloxycarbonyl)oxyethyl]-1-piperazinylcarbonyl}-1-(4-nitrobenzyloxycarbonyl)-pyrrolidine [prepared as described in Preparation 57(i)] and 1.97 g of triphenylphosphine in 25 ml of tetrahydrofuran, and the resulting mixture was stirred at the same temperature for 10 minutes. 283 μl of formic acid were then added dropwise to the mixture, and the mixture was stirred at the same temperature for 5 minutes and at room temperature for 1 hour. At the end of this time, the solvent was removed by distillation under reduced pressure, and the resulting residue was purified by column chromatography through silica gel, using a 20:1 by volume mixture of ethyl acetate and methanol as the eluent, to give 1.42 g of the title compound, as a colorless powder.

Workup

  1. stirringthe mixture was stirred at the same temperature for 5 minutes and at room temperature for 1 hour
  2. customAt the end of this time, the solvent was removed by distillation under reduced pressure
  3. customthe resulting residue was purified by column chromatography through silica gel
  4. additionby volume mixture of ethyl acetate and methanol as the eluent

Sources & evidence

ORD record
ord-d9a9cb79401c48978fec2c197f0a6637
Source dataset
uspto-grants-1998_01
Patent number
US05712267

Reaction notes

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