Ethyl Acetate → Ethyl 2-(3-chloro-4-bromobenzyl)-1,2-dihydro-1-thioxophthalazin-4-ylacetate

HRID 1413798Notes

Reaction equation

HRID 1413798 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:23]=[CH:24][C:25]=1[Br:26])[CH2:5][N:6]1[N:15]=[C:14]([CH2:16][C:17]([O:19][CH2:20][CH3:21])=[O:18])[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7]1=O.P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:28].C(OCC)(=O)C>C1(C)C(C)=CC=CC=1>[Cl:1][C:2]1[CH:3]=[C:4]([CH:23]=[CH:24][C:25]=1[Br:26])[CH2:5][N:6]1[N:15]=[C:14]([CH2:16][C:17]([O:19][CH2:20][CH3:21])=[O:18])[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7]1=[S:28]

Participants

5

Reactant 3

HCID 8857Ethyl AcetateHCID 14817Phosphorus sulfide (P2S5)HCID 20495807Ethyl 2-(3-chloro-4-bromobenzyl)-1,2-dihydro-1-oxophthalazin-4-ylacetate

Product 1

HCID 20495820Ethyl 2-(3-chloro-4-bromobenzyl)-1,2-dihydro-1-thioxophthalazin-4-ylacetateYield 58.9%

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

A mixture of ethyl 2-(3-chloro-4-bromobenzyl)-1,2-dihydro-1-oxophthalazin-4-ylacetate (1.8 g.) and phosphorus pentasulphide (2.5 g.) in xylene (100 ml.) was stirred and heated under reflux for 1 hour. The reaction solution was then cooled to room temperature, ethyl acetate (25 ml.) was added and the mixture was filtered through chromatographic silica (20 g.), the subsequent filtrate was evaporated and the residual solid obtained was recrystallised from ethanol to give ethyl 2-(3-chloro-4-bromobenzyl)-1,2-dihydro-1-thioxophthalazin-4-ylacetate (1.1 g.), m.p. 124°-126° C.

Workup

  1. temperatureheated
  2. temperatureunder reflux for 1 hour
  3. filtrationthe mixture was filtered through chromatographic silica (20 g.)
  4. customthe subsequent filtrate was evaporated
  5. customthe residual solid obtained
  6. customwas recrystallised from ethanol

Sources & evidence

ORD record
ord-e838063586d94ed39ab9eec52ef44c83
Source dataset
uspto-grants-1981_02
Patent number
US04251528

Reaction notes

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