Iridium-catalyzed enantioselective hydrogenation of unsaturated heterocyclic acids
Spiral binding: A highly enantioselective hydrogenation of unsaturated heterocyclic acids has been developed by using chiral iridium/spirophosphino oxazoline catalysts (see scheme; BArF-=tetrakis[3,5- bis(trifluoromethyl)phenyl]borate, Boc=tert-butoxycarbonyl). This reaction provided an efficient method for the preparation of optically active heterocyclic acids with excellent enantioselectivities. Copyright
Synthesis of the core structure of the fungal metabolite benesudon: Use of oxidative decarboxylation
(Chemical Equation Presented) The core structure (5) of the fungal metabolite benesudon (1) was synthesized, the key step being oxidative decarboxylation of acid 17.
Clive, Derrick L. J.,Minaruzzaman,Yang, Haikang
p. 5581 - 5583
(2007/10/03)
One-Pot Preparation of α-Cyanovinyl Ethers (2-Alkoxy-2-alkenenitriles) from Vinyl Ethers: Elaboration to 3-Alkoxy-2-oxo-3-alkenenitriles and Aluminium Chloride-Catalyzed Cycloadditions to Cyclopentadiene
A variety of α-cyanovinyl ethers have been prepared by 3 different routes and elaborated to 3-alkoxy-2-oxo-3-alkenenitriles.The latter, in the presence of cyclopentadiene and aluminium chloride, give novel bridged 7-membered cycloadducts with loss of hydrogen cyanide.
Hoffmann, H. M. R.,Giesel, Kunibert,Lies, Reinhard,Ismail, Zeinhom M.
p. 548 - 551
(2007/10/02)
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