Acetic Anhydride → 7-[(acetoxy)(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]-8,9-dihydropyrido[1,2-a]indol-6(7H)-one

HRID 847500Notes

Reaction equation

[C:1](OC(=O)C)(=[O:3])[CH3:2].[OH:8][CH:9]([C:24]1[N:25]=[CH:26][N:27]([C:30]([C:43]2[CH:48]=[CH:47][CH:46]=[CH:45][CH:44]=2)([C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=2)[C:31]2[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=2)[C:28]=1[CH3:29])[CH:10]1[C:22](=[O:23])[N:14]2[C:15]3[C:20]([CH:21]=[C:13]2[CH2:12][CH2:11]1)=[CH:19][CH:18]=[CH:17][CH:16]=3.C(=O)([O-])O.[Na+]>N1C=CC=CC=1.C(Cl)(Cl)Cl>[C:1]([O:8][CH:9]([C:24]1[N:25]=[CH:26][N:27]([C:30]([C:31]2[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=2)([C:37]2[CH:38]=[CH:39][CH:40]=[CH:41][CH:42]=2)[C:43]2[CH:44]=[CH:45][CH:46]=[CH:47][CH:48]=2)[C:28]=1[CH3:29])[CH:10]1[C:22](=[O:23])[N:14]2[C:15]3[C:20]([CH:21]=[C:13]2[CH2:12][CH2:11]1)=[CH:19][CH:18]=[CH:17][CH:16]=3)(=[O:3])[CH3:2]

Participants

Conditions

Temperature: 60 °C

Procedure

Acetic anhydride (1.26 g) was added to a solution of 8,9-dihydro-7-[(hydroxy)(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]pyrido[1,2-a]indol-6(7H)-one (1.34 g, a mixture of the isomers A and B) in pyridine (20 ml). After being stirred at 60° C. for 2 hours, the solution was evaporated in vacuo. The residue obtained was diluted with chloroform and neutralized with an aqueous sodium hydrogencarbonate solution. The separated organic layer was dried over anhydrous magnesium sulfate and evaporated in vacuo to give 7-[(acetoxy)(5-methyl-1-trityl-1H-imidazol-4-yl)methyl]-8,9-dihydropyrido[1,2-a]indol-6(7H)-one as an oil, which was used in the next reaction without purification.

Workup

customthe solution was evaporated in vacuo
customThe residue obtained
dry with materialThe separated organic layer was dried over anhydrous magnesium sulfate
customevaporated in vacuo

Sources & evidence

ORD record: ord-355e2799ddfa47f4a31f2d0b73f5bcee
Source dataset: uspto-grants-1992_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05141945

Reaction notes

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