p-Xylyl bromide → HCID 67444656, compound

HRID 1667549Notes

Reaction equation

[CH2:1]([N:3]([CH2:23][CH3:24])[C:4]1[CH:22]=[CH:21][C:7]([CH:8]=[N:9][NH:10][C:11](=[O:20])[C:12]2[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=2)=[CH:6][CH:5]=1)[CH3:2].Br[CH2:26][C:27]1[CH:32]=[CH:31][C:30]([CH3:33])=[CH:29][CH:28]=1>>[CH2:23]([N:3]([CH2:1][CH3:2])[C:4]1[CH:5]=[CH:6][C:7]([CH:8]=[N:9][N:10]([CH2:26][C:27]2[CH:32]=[CH:31][C:30]([CH3:33])=[CH:29][CH:28]=2)[C:11](=[O:20])[C:12]2[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=2)=[CH:21][CH:22]=1)[CH3:24]

Participants

Reactant 2

HCID 7721p-Xylyl bromide

HCID 584764HCID 584764, compound2×

Product 1

HCID 67444656HCID 67444656, compound

Procedure

Referring to FIG. 2, thus, a two-step procedure was explored whereby the amine of compound 1 was protected prior to conversion to compound 3. Specifically, the amino group of compound 1 was protected by reacting with α-bromo-p-xylene to give 4-methoxy-benzoic acid N′-(4-diethylamino-benzylidene)-N-(4-methyl-benzyl)-hydrazide (compound 2). This was followed by the simultaneous demethylation and deprotection of the N-benzyl group of compound 2 by ether cleavage with boron tribromide. This produced compound 3, with an overall yield of 27%.

Sources & evidence

ORD record: ord-fcd4beb604df42fdaf1b80d6fa5f6d24
Source dataset: uspto-grants-2011_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08044241B2

Reaction notes

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