Aryltriolborates as Air- and Water-Stable Bases for Wittig Olefination
作者:Wenhua Huang、Shuang-Hong Zhao、Ning Xu
DOI:10.1055/s-0034-1378919
日期:——
1-tris(hydroxymethyl)ethane, and aqueous tetrabutylammonium hydroxide. The aryltriolborates can be used as bases in Wittigreactions of aromatic aldehydes with all three types of phosphorus ylides: stabilized and semistabilized ylides can be generated at room temperature, and nonstabilizedylides at 120 °C (bath temperature). Tetrabutylammonium aryltriolborates have been synthesized in 37–66% yield by a one-pot
Peroxide-Free Co(OAc)2-Catalyzed Radical Addition of sp3 C–H Bonds to Alkynes
作者:Wanzhi Chen、Min Zhang、Yun Zhao
DOI:10.1055/s-0036-1588909
日期:——
Abstract Cobalt-catalyzed radical addition of C–Hbondsadjacent to an oxygenatom towards alkynes is described. The reaction proceeded at 60 °C without using additional radical initiators, and leads to 2-vinyl ether derivatives in good yields. Cobalt-catalyzed radical addition of C–Hbondsadjacent to an oxygenatom towards alkynes is described. The reaction proceeded at 60 °C without using additional
Convenient synthetic routes to KN-93, N-(2-[[(2E)-3-(4-chlorophenyl)prop-2-enyl](methyl)amino]methyl}phenyl)-N-(2-hydroxyethyl)-4-methoxybenzenesulfonamide, a well-known Ca²+/calmoduline-dependent protein kinase II (CaMKII) inhibitor, are described. The methods proposed start from easily available reagents and allow ready preparation of the final compound in moderate overall yields. Most of the
Aldehydes were efficiently transformed into allylic dioxolanes by a Wittig-type reaction, using 1,3-dioxolan-2-yl-methyltriphenylphosphonium bromide under phase transfer conditions. The substituent kinetic effects were studied, and related to Hammett values and electrochemical potentials. (C) 1998 Elsevier Science Ltd. All rights reserved.