Indium(III) chloride-catalyzed Mukaiyama–Michael addition: synthesis of 2,6-anti-tetrahydropyrans
摘要:
In the presence of a catalytic amount of indium(III) chloride (InCl(3)), silyl enol ethers react with dihydropyranones at ambient temperature via Mukaiyama-Michael addition to afford the corresponding 2,6-anti-tetrahydropyran adducts in moderate to good yields. This simple and mild method proceeds under neat conditions and involves simple aqueous work-up. Indium(III) chloride can be recovered and reused without significant decrease in reactivity. (C) 2011 Published by Elsevier Ltd.
Catalytic, Enantioselective Hetero-Diels-Alder Reaction with Novel, Chiral Bis-Titanium(IV) Catalyst
作者:Satoshi Kii、Takuya Hashimoto、Keiji Maruoka
DOI:10.1055/s-2002-31927
日期:——
Our recently designed chiral bis-titanium(IV) catalyst can be successfully utilized for the catalyticenantioselective hetero-Diels-Alder reaction of aldehyde and Danishefsky's diene. The high asymmetric induction is achievable in the case of sterically less hindered aldehydes.
In the presence of a catalytic amount of indium(III) chloride (InCl(3)), silyl enol ethers react with dihydropyranones at ambient temperature via Mukaiyama-Michael addition to afford the corresponding 2,6-anti-tetrahydropyran adducts in moderate to good yields. This simple and mild method proceeds under neat conditions and involves simple aqueous work-up. Indium(III) chloride can be recovered and reused without significant decrease in reactivity. (C) 2011 Published by Elsevier Ltd.
Optically Active Cationic Cobalt(III) Complexes: Highly Efficient Catalysts for Enantioselective Hetero Diels–Alder Reaction
Opticallyactiveβ-ketoiminato cobalt(III) complexes were developed for use as effective catalysts of the enantioselective hetero Diels–Alder reaction of aryl and alkyl aldehydes with 1-methoxy-[3-(tert-butyldimethylsilyl)oxy]-1,3-butadiene. In the presence of 5 mol% cationic cobalt(III) triflate complexes derived from opticallyactive 1,2-bis(3,5-dimethylphenyl)-1,2-ethylenediamine, the hetero Diels–Alder