Benzotriazole-Mediated Conversions of Aromatic and Heteroaromatic Aldehydes to Functionalized Ketones
摘要:
Aromatic and heteroaromatic aldehydes reacted with benzotriazole and triethyl orthoformate in THF to give the corresponding alpha-(benzotriazol-1-yl)aryl ethyl ethers 7 in good yield. The novel acyl anion precursors 7 underwent smooth lithiation at the methine group followed by trapping with alkyl halides, aldehydes, ketones, and imines to yield the expected substituted intermediates of type 9, which were hydrolyzed under mild conditions without isolation. Benzaldehyde, methyl-, chloro-, and methoxy-substituted benzaldehydes, 1-naphthalenecarboxaldehyde, 2- and 3-furaldehydes, 2- and 3-thiophenecarboxaldehydes, and 2-pyridinecarboxaldehyde were all transformed in this manner into a variety of aryl and heteroaryl ketones with alkyl (10), alpha-hydroxyalkyl (12 and 13), alpha-aminoalkyl (14) and acyl(15) substituents.
A new simple route to furanic ketones; Preparation of Elsholtzione, naginata ketone and perilla ketone.
作者:Gérard Cahiez、Pierre-Yves Chavant、Eric Metais
DOI:10.1016/s0040-4039(00)79145-3
日期:1992.9
Copper- or iron-catalyzed acylation of organomanganese reagents allows to obtain 3- and 2-acylfurans in high yields. Elsholtzione, naginata ketone and perilla ketone have been prepared according to this procedure.
Destannylative acylation of 1-[(2-methoxyethoxy)methoxy]-2-(phenylsulfonyl)-2-(tributylstannyl)cyclopropane: A novel route to 3-acylfurans
作者:Manat Pohmakotr、Auntika Takampon
DOI:10.1016/0040-4039(96)00852-0
日期:1996.6
Destannylative acylation of 1-[(2-methoxyethoxy)methoxy]-2-(phenylsulfonyl)-2-(tributylstannyl)cyclopropane (1) provided dihydrofurans 5 in good yields, which upon treatment with BF3.OEt2 in CH2Cl2 led to the formation of 3-acylfurans 6 in moderate yields. The reaction was proposed to proceed via the intramolecular Prins-type reaction of the oxonium intermediate 7.
Organomanganese(II) Reagents; X<sup>1</sup>. A Convenient Preparation of Various Acetoxyketones, Keto-nitriles, Keto-esters, Keto-acids, Diketones, and Heterocyclic Ketones (Acylheterocycles) via Acylation of Organomanganese(II) Reagents
作者:G. Friour、G. Cahiez、J. F. Normant
DOI:10.1055/s-1985-31101
日期:——
Gruenanger; Mantegani, Gazzetta Chimica Italiana, 1959, vol. 89, p. 913,916
作者:Gruenanger、Mantegani
DOI:——
日期:——
FRIOUR, G.;CAHIEZ, G.;NORMANT, J. F., SYNTHESIS, BRD, 1985, N 1, 50-54