Reaction of thionolactones with zinc enolate: new synthesis of vinylogous carbonates
摘要:
Reaction of various thionolactones, prepared from the lactones and Lawesson's reagent, with methyl bromozinc-acetate afforded the corresponding vinylogous carbonates in good yields under mild conditions. (C) 1999 Elsevier Science Ltd. All rights reserved.
One-Pot Sequential 1,4- and 1,2-Reductions of α,β-Unsaturated δ-Lactones to the Corresponding δ-Lactols with CuCl and NaBH4 in Methanol
作者:Yasunobu Matsumoto、Masahiro Yonaga
DOI:10.1055/s-0033-1340195
日期:——
An efficient, one-pot method for the highly chemoselective synthesis of δ-lactols fromα,β-unsaturatedδ-lactones using CuCl and NaBH4 in methanol was developed.
Phase transfer catalysis and homogeneous reactions with β-oxyalkyl radicals from organomercurials
作者:José Barluenga、Joaquín López-Prado、Pedro J. Campos、Gregorio Asensio
DOI:10.1016/s0040-4020(01)82459-5
日期:1983.1
β-hydroxyalkyl radicals generated by sodium borohydride reduction of oxymercurials react with electron deficient olefins to give addition compounds in an homogeneous process. Heterogeneous reactions are also successful in the presence of catalytic amounts of surfactants and provide a superior method for the “one pot” reductive alkylation of oxymercurials.
Cooperative Catalysis of Samarium Diiodide and Mercaptan in a Stereoselective One-Pot Transformation of 5-Oxopentanals into δ-Lactones
作者:Jue-Liang Hsu、Chao-Tsen Chen、Jim-Min Fang
DOI:10.1021/ol9911526
日期:1999.12.1
[GRAPHICS]We demonstrate a general method for conversion of various 5-oxopentanals to substituted delta-lactones and 1-oxa-2-decalones by the synergistic catalysis of samarium diiodide and 2-propanethiol (or disulfide), The deliberate use of mercaptan is advantageous to facilitate the catalytic cycle, This method shows high stereoselectivities, and an enantioselective procedure is feasible by using the chiral mercaptan (1R,2S)-1 phenyl-2-(N-acetamido)propanethiol as a promoter.
Determination of enantiomeric purity of chiral lactones. A general method using nuclear magnetic resonance
作者:Ignac J. Jakovac、J. Bryan Jones
DOI:10.1021/jo01327a028
日期:1979.6
Free-Radical Ring Contraction of Six-, Seven-, and Eight-Membered Lactones by a 1,2-Shift Mechanism. A Kinetic and <sup>17</sup>O NMR Spectroscopic Study
作者:David Crich、Xiaohua Huang、Athelstan L. J. Beckwith