Iron-Catalyzed Dioxygenation of Alkenes and Terminal Alkynes by using (Diacetoxyiodo)benzene as Oxidant
作者:B. T. V. Srinivas、Vikas S. Rawat、Bojja Sreedhar
DOI:10.1002/adsc.201500681
日期:2015.11.16
syn-diacetoxylation of alkenes and 1,2-oxyacetoxylation of terminal alkynes has been developed using (diacetoxyiodo)benzene as oxidant. A broad range of internal and terminal alkenes, including electron-rich as well as electron-deficient alkenes, gave the desired products in good to excellent yields with high diastereoselectivity (up to >99:1 dr). In addition the high catalytic activity of ironcatalysis for the
Silver(I)-catalyzed reaction of terminal alkynes with (diacetoxyiodo)benzene: a convenient, efficient and clean preparation of α-acetoxy ketones
作者:Guisheng Deng、Jing Luo
DOI:10.1016/j.tet.2013.04.122
日期:2013.7
Silver(I)-catalyzed reaction of terminal alkynes with (diacetoxyiodo)benzene in wet acetonitrile at room temperature afforded the corresponding α-acetoxy ketones in 55–93% yields. The salient features of this reaction are the effective utilization of PhI(OAc)2, high chemoselectivity, excellent yields, mild reaction conditions and the experimental simplicity. A plausible mechanism has been proposed
Bakers' yeast cell-free extract was found to reduce 1-acetoxy-2-alkanones to (S)-1-acetoxy-Z-alkanols in 59 - 88% yield and 95 - >99% ee by use of a catalytic amount of NADPH with glucose as a hydride source and without addition of any enzyme for the cofactor regeneration.
Riehl,J.-J., Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1960, vol. 250, p. 4174 - 4176
作者:Riehl,J.-J.
DOI:——
日期:——
The baker's yeast reduction of 1-acetoxy-2-alkanones in the presence of a sulfur compound
Improved enantioselectivity was achieved in the baker's yeast reduction of the 1-acetoxy-2-alkanone derivatives by the addition of a sulfur compound such as L-cysteine and phenyl vinyl sulfide. The reaction rate of the baker's yeast reduction was accelerated using a sulfur compound as an additive. The migration of the acetyl group and the hydrolysis of the acetoxy group of the substrate was suppressed using a sulfur compound. (C) 1997 Elsevier Science Ltd.