Nouvelle méthode de préparation d'éthers vinyliques à partir d'acétals
作者:Francis Barbot、Philippe Miginiac
DOI:10.1002/hlca.19790620509
日期:1979.7.17
A new way to vinylic ethers from acetals
缩醛制乙烯醚的新方法
A Major Breakthrough in the Use of Alkoxycarbene Complexes of Chromium and Tungsten for the Synthesis of Elaborate Organic Compounds: Dihydropyridine Induced Reductions and Cascade Insertion Reactions
Alkoxy (alkyl)carbene complexes of tungsten and chromium react with dihydropyridine and N-methyldihydropyridine to give respectively pyridinium ylid complexes and N-methylpyridinium tungstates and chromates. These two types of complexes can be used, for the former, as cyclopropanation reagents, for the latter, as unprecedented initiators of cascade multiinsertions of olefins, alkynes and CO. These
Living and Alternating Cationic Copolymerization of <i>o</i>-Phthalaldehyde and Various Bulky Enol Ethers: Elucidation of the “Limit” of Polymerizable Monomers
Cationiccopolymerization of various bulky enol ethers, which have been difficult to homopolymerize and/or copolymerize, was shown to proceed when o-phthalaldehyde (OPA) was used as a comonomer. A series of enol ethers with various substituents on the β-carbon was synthesized from aliphatic aldehydes and alcohols. The relationships between the structures of the enol ethers and the copolymerization
PREPARATION AND REACTIONS OF 2-SUBSTITUTED 3-TRIMETHYLSILYL-4-EN-1-ONE SYSTEM
作者:Isao Kuwajima、Toshihiko Tanaka、Kunio Atsumi
DOI:10.1246/cl.1979.779
日期:1979.7.5
Various 3-trimethylsilyl-4-en-1-one types of compounds have been prepared by using 3-trimethylsilylallyl alcohol. Some of them can be efficiently converted into the corresponding cyclization products, 3-cyclopenten-1-ols, or dienone types of compounds.
Gold(I)-Catalyzed Access to Tetrahydropyran-4-ones from 4-(Alkoxyalkyl)oxy-1-butynes: Formal Catalytic Petasis-Ferrier Rearrangement
作者:Hyo Jin Bae、Wook Jeong、Ji Hyung Lee、Young Ho Rhee
DOI:10.1002/chem.201002918
日期:2011.2.1
Goldcycle redesigned: By utilizing the alkynophilic effect of gold(I) complexes, a new method for the synthesis of highlysubstituted cis‐2,6‐tetrahydropyranones was developed, which represents a catalytic surrogate of the Petasis–Ferrier rearrangement (see scheme). Of particular interest is the unique effect the phosphine ligand has on the diastereoselectivity of the alkyl groups at the 2‐ and 6‐positions