Pyrrole → HCID 68968622, compound

HRID 1985596Notes

Reaction equation

HRID 1985596 reaction equation
[CH3:1][O:2][C:3]([C:5]1[N:6]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C:7]([C:12]([O:14][CH3:15])=[O:13])=[C:8]([OH:11])[C:9]=1[OH:10])=[O:4].N1[CH:27]=[CH:26][CH:25]=[CH:24]1.[C:28]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C[CH:29]=1.N(C(OCC)=O)=N[C:49](OCC)=O>O1CCCC1>[CH3:1][O:2][C:3]([C:5]1[N:6]([CH2:16][C:17]2[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=2)[C:7]([C:12]([O:14][CH3:15])=[O:13])=[C:8]2[C:9]=1[O:10][CH2:49][C:25]([CH2:28][CH3:29])([CH2:26][CH3:27])[CH2:24][O:11]2)=[O:4]

Participants

6

Reactant 4

HCID 8027PyrroleHCID 11776TriphenylphosphineHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 4866738Dimethyl 1-benzyl-3,4-dihydroxy-1H-pyrrole-2,5-dicarboxylate

Product 1

HCID 68968622HCID 68968622, compound

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

In the present method, 1-Benzyl-3,4-dihydroxy-1H-pyrrole-2,5-dicarboxylic acid dimethyl ester, the pyrrole derivative labeled A4 in FIG. 4 (hereinafter referred to as compound A4) is first synthesized from commercially available chemicals according to prior art techniques (see A. Merz, R. Schropp, E. Dotterl, “3,4-Dialkoxypyrroles and 2,3,7,8,12,13,17,18-Octaalkoxyporphyrins”, Synthesis, 7, pp. 795-800, (1995)). Then, a solution of compound A4,2,2-diethyl-1,3-propanediol (labeled B4 in FIG. 4), triphenylphosphine (PPh3; labeled C4 in FIG. 4), and diethyl azodicarboxylate (DEAD; labeled D4 in FIG. 4) is refluxed in tetrahydrofuran (THF) for about 10-20 hours (preferably under an inert atmosphere). The reaction mixture is then quenched using a small amount of water, mixed with silica gel, and evaporated to dryness. The resulting material is loaded into a silica gel column and eluded by hexane and dichloromethane (1:1 volume ratio) to yield 2-Benzyl-6,6-diethyl-6,7-dihydro-2H,5H-4,8-dioxa-2-aza-azulene-1,3-dicarboxylic acid dimethyl ester, the pyrrole derivative labeled E4 in FIG. 4 (hereinafter referred to as compound E4).

Workup

  1. customis first synthesized from commercially available chemicals
  2. customThe reaction mixture is then quenched
  3. additionmixed with silica gel
  4. customevaporated to dryness

Sources & evidence

ORD record
ord-42586df3453b4f518ed640a549e38913
Source dataset
uspto-grants-2009_06
Patent number
US07547658B2

Reaction notes

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