Stereoselective Synthesis of Dienyl Phosphonates via Extended Tethered Ring-Closing Metathesis
摘要:
Allylphosphonates of allylic alcohols were converted to conjugated dienyl phosphonates in a one-flask reaction, comprising a ring-closing metathesis (RCM), a base-induced ring-opening, and an alkylation. The ring-opening proceeds with very high diastereoselectivity, giving exclusively the (1Z,3E)-configured dienes. Single diastereomers and mixtures of diastereomers can be used as starting materials without noticeable effect on the diastereoselectivity of the sequence.
A Convenient Stereoselective Synthesis of 1,3-Dienylphosphonates and 1-En-3-ynylphosphonates and Their Phosphine Oxide Analogs
作者:Xiaoling Huang、Chunming Zhang、Xiyan Lu
DOI:10.1055/s-1995-4000
日期:1995.7
Ethynylphosphonates (or phosphine oxides) react with a lithium halide in acetic acid at 70°C to yield (Z)-2-halovinylphosphonates (or phosphine oxides), which give (1Z,3E)-dienylphosphonates and (1Z)-en-3-ynylphosphonates (phosphine oxides) after coupling with alkenes and alkynes, respectively, in the presence of a palladium catalyst.
Preparation of New Wittig Reagents and Their Application to the Synthesis of α,β-Unsaturated Phosphonates
作者:Yibo Xu、Michael T. Flavin、Ze-Qi Xu
DOI:10.1021/jo9608275
日期:1996.1.1
The Wittig reagent [(diethoxyphosphinyl)methylidene]triphenylphosphorane (1b) has been successfully synthesized for the first time via its phosphonium triflate salt (4a), by treating (diethoxyphosphinyl)methyl triflate with triphenylphosphine. The procedure has been applied to the synthesis of other phosphoranes and phosphonium salts. The new Wittig reagents thus synthesized were treated with various
Suzuki and Stille Cross-Coupling Reactions from β-Iodovinylphosphonate: Stereoselective Access to Various Substituted Vinylphosphonates
作者:Mohamed Abarbri、Emilie Thiery
DOI:10.1055/s-0034-1378360
日期:——
Stereoselective synthesis of beta-arylvinyl, dienyl, and enynylphosphonates was achieved from diethyl 2-iodovinylphosphonate via Suzuki or Stille cross-coupling reactions in good yields.