A Highly Stereoselective Synthesis of (E)-α-Bromoacrylates
作者:Keiko Tago、Hiroshi Kogen
DOI:10.1016/s0040-4020(00)00811-5
日期:2000.11
Novel reagent, methyl bis(2,2,2-trifluoroethoxy)bromophosphonoacetate (5a), was designed and prepared in order to efficiently synthesize (E)-α-bromoacrylates 7, from which widely useful precursors for various C–C bond formations were prepared. Horner–Wadsworth–Emmons (HWE) reaction of various aldehydes with 5a in the presence of t-BuOK and 18-C-6 gave corresponding (E)-α-bromoacrylate derivatives with
One-pot process in phosphonium-iodonium ylides: nucleophilic substitution and the Wittig reaction
作者:E. D. Matveeva、T. A. Podrugina、A. S. Pavlova、A. V. Mironov、N. S. Zefirov
DOI:10.1007/s11172-008-0061-4
日期:2008.2
nucleophilic substitution in mixed phosphonium-iodonium ylides was investigated. The iodonium group is replaced by such S-containing nucleophiles as the thiocyanate anion or thiourea, as well as by halide ions. The structure of the reaction product with the thiocyanate ion was established by X-ray diffraction. A one-pot process involving the nucleophilic substitution and the Wittig reaction was developed
研究了混合鏻-碘鎓叶立德中的亲核取代。碘鎓基团被诸如硫氰酸根阴离子或硫脲之类的含硫亲核试剂以及卤离子取代。通过 X 射线衍射确定了与硫氰酸根离子反应产物的结构。开发了涉及亲核取代和 Wittig 反应的一锅法。