Facile generation and trapping of .alpha.-oxo-o-quinodimethanes: synthesis of 3-aryl-3,4-dihydroisocoumarins and protoberberines
摘要:
Fluorodesilylation of o-((trimethylsilyl)methyl)benzoyl derivatives 5 in the presence of aromatic aldehydes and alkyl fumarates gives 3-aryl-3,4-dihydroisocoumarins 6 and alpha-tetralones 10, respectively. Reaction of 5 with 3,4-dihydroisoquinolinium salts 19 leads to 8-oxoberbines 21. Using this procedure, racemic hydrangenol, phyllodulcin, tetrahydropalmatine (22a), and canadine (22b) have been synthesized.
BLEACHING AGENT COMPRISING CATIONIC 3,4-DIHYDROISOQUINOLINE DERIVATIVES, SPECIAL ALKANOL AMINES AND HYDROGEN PEROXIDE
申请人:Gross Wibke
公开号:US20110056508A1
公开(公告)日:2011-03-10
Agent for bleaching keratinic fibers containing hydrogen peroxide, at least one cationic 3,4-dihydroisoquinoline derivate of general structure (I)—
and at least one alkanol amine of the following general structure (II)—
where n is a natural number from 2 to 6. The invention further relates to use of the agent for bleaching hair and to a corresponding method.
CATIONIC DIHYDROISOQUINOLINIUM DERIVATIVES FOR USE AS BLEACH ACTIVATORS
申请人:Gross Wibke
公开号:US20110146005A1
公开(公告)日:2011-06-23
Agent for dyeing while simultaneously bleaching keratin fibers. The agent contains, in a cosmetic carrier, at least one oxidation dye precursor and at least one cationic 3,4-dihydorisoquinolinium derivative.