Nucleophilic benzoylation using lithiated methyl mandelate as a synthetic equivalent of the benzoyl carbanion. Oxidative decarboxylation of α-hydroxyacids
摘要:
The synthesis of alkyl aryl ketones using lithiated methyl mandelate as a synthetic equivalent of the benzoyl carbanion is reported (Umpolung). The methodology involves alkylation of methyl mandelate, hydrolysis of the ester group and oxidative decarboxylation of the resulting -alpha -hydroxyacids. The last step is carried out in a catalytic aerobic way using a Co(III) complex in the presence of pivalaldehyde under very mild and advantageous conditions. The procedure is also applied to methyl mandelates substituted on the aromatic ring. (C) 2001 Elsevier Science Ltd. All rights reserved.
Catalytic aerobic oxidative decarboxylation of α-hydroxy-acids. Methyl mandelate as a benzoyl anion equivalent
摘要:
The monomeric square-planar cobalt(III) complex of bis-N,N'-disubstituted oxamides catalyses the oxidative decarboxylation of alpha-hydroxy acids with molecular oxygen/pivalaldehyde with very good yields. This reaction offers an interesting alternative in the use of methyl mandelate as a convenient benzoyl anion equivalent. (C) 1998 Elsevier Science Ltd. All rights reserved.
Nucleophilic benzoylation using lithiated methyl mandelate as a synthetic equivalent of the benzoyl carbanion. Oxidative decarboxylation of α-hydroxyacids
作者:Gonzalo Blay、Isabel Fernández、Pilar Formentin、Belén Monje、José R Pedro、Rafael Ruiz
DOI:10.1016/s0040-4020(00)01097-8
日期:2001.2
The synthesis of alkyl aryl ketones using lithiated methyl mandelate as a synthetic equivalent of the benzoyl carbanion is reported (Umpolung). The methodology involves alkylation of methyl mandelate, hydrolysis of the ester group and oxidative decarboxylation of the resulting -alpha -hydroxyacids. The last step is carried out in a catalytic aerobic way using a Co(III) complex in the presence of pivalaldehyde under very mild and advantageous conditions. The procedure is also applied to methyl mandelates substituted on the aromatic ring. (C) 2001 Elsevier Science Ltd. All rights reserved.
Catalytic aerobic oxidative decarboxylation of α-hydroxy-acids. Methyl mandelate as a benzoyl anion equivalent
作者:Gonzalo Blay、Isabel Fernández、Pilar Formentin、JoséR. Pedro、Antonio L. Roselló、Rafael Ruiz、Yves Journaux
DOI:10.1016/s0040-4039(98)00482-1
日期:1998.5
The monomeric square-planar cobalt(III) complex of bis-N,N'-disubstituted oxamides catalyses the oxidative decarboxylation of alpha-hydroxy acids with molecular oxygen/pivalaldehyde with very good yields. This reaction offers an interesting alternative in the use of methyl mandelate as a convenient benzoyl anion equivalent. (C) 1998 Elsevier Science Ltd. All rights reserved.