Allyl bromide → HCID 272210, compound
Reaction equation
[Br:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[CH:8]=[C:7]([OH:12])[CH:6]=[CH:5]2.[CH2:13](Br)[CH:14]=[CH2:15]>[OH-].[K+]>[CH2:15]([O:12][C:7]1[CH:6]=[CH:5][C:4]2[C:9](=[CH:10][CH:11]=[C:2]([Br:1])[CH:3]=2)[CH:8]=1)[CH:14]=[CH2:13]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
In reaction D, 6-bromo-2-naphthol and allylbromide, represented by the graphic formulae VIII and XIII, respectively, are refluxed together in ethanoic potassium hydroxide to produce 2-allyloxy-6-bromonaphthalene of graphic formula XIV. 2-Allyloxy-6-bromonaphthalene undergoes a Claisen rearrangement under high temperatures followed by acid catalyzed ring closure to produce 7-bromo-l,2-dihydro-2-methylnaphtho[2,1-b]furan of graphic formula XV. See Organic Reaction Vol. II, 1944, pages 1 to 48. The conversion of 7-bromo-1,2-dihydro-2-methylnaphtho[2,1-b]furan to 7-hydroxy-1,2-dihydro-2-methylnaphtho[2,1-b]furan represented by graphic formuale XVI is accomplished thru a series of steps described in Organic Synthesis Vol.49 pages 90-93, 1972. Other substituted 7-hydroxy-1,2-dihydronaphtho[2,1-b]furans may be synthesized by replacing allylbromide (XIII) with another reactant such as 3-bromo-2-methyl-propene. Coupling the resulting 7-hydroxy-1,2-dihydronaphtho[2,1-b]furan with the appropriate propargyl alcohol would result in compounds represented by graphic formula IB having formula IIB as group A. ##STR8##
Sources & evidence
- ORD record
- ord-7392f30115324ac3bc2b8934d072f88c
- Source dataset
- uspto-grants-1997_10
- Patent number
- US05674432
Reaction notes
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