Recherches sur la formation et la transformation des esters XLII. Sur la phosphorylation de différents types d'alcools, et particulièrement d'alcools non saturés
Tertiary alcohois and terpenic alcohols cannot be phosphorylated by means of polyphosphoric acid or phosphorus pentoxide even in the presence of a tertiary base.
A convenient general procedure for the conversion of alcohols into their monophosphate esters
作者:T. A. Khwaja、C. B. Reese、J. C. M. Stewart
DOI:10.1039/j39700002092
日期:——
o-Phenylene phosphorochloridate (IV), readily prepared from catechol in good yield, reacts rapidly and quantitatively with stoicheiometric amounts of alcohols (including tertiary alcohols) in the presence of a suitable base (triethylamine or 2,6-lutidine) and in a suitable solvent (dioxan, tetrahydrofuran, or benzene). Alkyl o-hydroxyphenyl phosphate salts (IX) were thus obtained in virtually quantitative
Catalytic S<sub>N</sub>
2′- and Enantioselective Allylic Substitution with a Diborylmethane Reagent and Application in Synthesis
作者:Ying Shi、Amir H. Hoveyda
DOI:10.1002/anie.201600309
日期:2016.3.1
A catalytic method for the site‐ and enantioselective addition of commercially available di‐B(pin)‐methane to allylic phosphates is introduced (pin=pinacolato). Transformations may be facilitated by an NHC–Cu complex (NHC=N‐heterocyclic carbene) and products obtained in 63–95 % yield, 88:12 to >98:2 SN2′/SN2 selectivity, and 85:15–99:1 enantiomeric ratio. The utility of the approach, entailing the
介绍了一种将市售的二-B(pin)-甲烷位点和对映选择性加成到烯丙基磷酸酯上的催化方法(pin=pinacolato)。 NHC-Cu 络合物(NHC=N-杂环卡宾)可促进转化,产物收率 63-95%,选择性为 88:12 至 >98:2 S N 2′/S N 2,选择性为 85:15 –99:1 对映体比例。该方法的实用性涉及不同的催化交叉偶联过程,其在细胞毒性天然产物 rhopaloic Acid A 的正式合成中的应用凸显了该方法的实用性。
One-pot synthesis of organophosphate monoesters from alcohols
作者:Lucas M. Lira、Dimitar Vasilev、Ronaldo A. Pilli、Ludger A. Wessjohann
DOI:10.1016/j.tetlet.2013.01.059
日期:2013.3
A one-pot procedure for the phosphorylation of alcohols provides the corresponding phosphate monoesters in improved yields. The protocol features the use of tetrabutylammonium hydrogen phosphate and trichloroacetonitrile, followed by purification of the crude product by flash chromatography on silica gel. The final step, cation exchange chromatography, affords the organophosphates as ammonium salts that are usually required for biochemical applications. The mechanism appears to be phosphate rather than alcohol activation by trichloroacetonitrile. (c) 2013 Elsevier Ltd. All rights reserved.
399. Phosphoramidic halides: phosphorylating agents derived from morpholine