Catalytic asymmetric Darzens condensation under phase-transfer-catalyzed conditions
作者:Shigeru Arai、Takayuki Shioiri
DOI:10.1016/s0040-4039(98)00081-1
日期:1998.4
The catalytic asymmetric Darzenscondensation promoted by the quaternary ammonium salt (PTC A) derived from cinchonine as a phase-transfer catalyst is described. Treatment of phenacyl chloride with various aldehydes under mild reaction conditions afforded the corresponding desired product in good yield with good to moderate enantiomeric excess.
Photoinduced transformation of α,β-epoxyketones to β-hydroxyketones by Hantzsch 1,4-dihydropyridine
作者:Jun Zhang、Mei-Zhong Jin、Wei Zhang、Li Yang、Zhong-Li Liu
DOI:10.1016/s0040-4039(02)02426-7
日期:2002.12
Irradiation (lambda >300 nm) of Hantzsch 1,4-dihydropyridine with aromatic alpha,beta-epoxyketones in acetonitrile selectively breaks the Calpha-O bond of the epoxides giving the corresponding beta-hydroxyketones in excellent yields. (C) 2002 Elsevier Science Ltd. All rights reserved.
Reductive transformation of α,β-epoxy ketones and other compounds promoted through photoinduced electron transfer processes with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI)
Photoreactions of epoxy ketones, aromatic ketones, haloketones, and aromatic halides with 1,3-dimethyl-2-phenylbenzimidazoline (DMPBI) were studied Photoinduced single-electron transfer from DMPBI to such substrates initiates the reactions followed by radical radical rearrangement and reduction to finally give several reduced products in modest to good yields. (C) 1999 Elsevier Science Ltd. All rights reserved.
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