jo5b02187_si_001.cif (366.3 kB)
A Family of Routes to Substituted Phenols, Including Meta-Substituted Phenols
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posted on 2015-12-18, 00:00 authored by Wenjie Shao, Derrick L. J. CliveA new family of routes
to substituted phenols has been developed.
2-Bromo-3-methoxycyclohex-2-en-1-ones are readily deprotonated at
C-6, and the resulting anions react smoothly with a variety of electrophiles;
treatment with DBU in PhMe at room temperature then results in efficient
aromatization to benzene derivatives of a regiochemically defined
substitution pattern. This sequence affords phenolic azides (ArN3), sulfides (ArSR, ArSAr′), selenides (ArSePh), alcohols
[ArCH(OH)R], amino derivatives [ArCH(NHSO2Ar′)R),
and 1,2-benzenediols. A complementary set of substitution patterns
is obtained by DIBAL-H reduction or reaction with a Grignard reagent
before aromatization; the latter process gives compounds in which
the newly introduced substituent is meta to the phenolic hydroxyl.
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electrophileregiochemicallyArSRsequencedeprotonatedcompoundmetasulfidesubstituentsubstitution patternsvarietySubstituted PhenolsPhMeArSArBromoGrignard reagentlatter processPhenolsAbenzene derivativesphenolic hydroxylArSePhbenzenediolselenidephenolic azidesArNanionroom temperatureDBUsubstitution patternaromatization
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