Protonation of acyl anion equivalents generated from acylphosphonates: nonhydride access to the aldehyde oxidation state from the carboxylic acid oxidation state
摘要:
Acylphosphonates, which are easily available from carboxylic acids, are potent acyl anion precursors and undergo cyanide ion promoted phosphonate-phosphate rearrangement to provide the corresponding acyl anion equivalents as reactive intermediates. The protonation of these acyl anion equivalents furnished cyanohydrin O-phosphates in good yields. For the high yield formation of cyanohydrin O-phosphates from arylphosphonates THF should be used and from alkylphosphonates DME was used. (c) 2006 Elsevier Ltd. All rights reserved.
Cyanophosphates (CPs) can be easily prepared from either ketones or aldehydes, and their reaction with NaN3–Et3N·HCl results in the formation of azidotetrazoles. Under microwave irradiation, successive fragmentation of the azidotetrazoles generates alkylidene carbenes that undergo [1,2]-rearrangement and are transformed into homologous alkynes. Treatment of ketone-derived CPs with TMSN3 and Bu2SnO
the presence of gold nanoparticles supported on ZrO2 proceeded efficiently under mild reaction conditions to give the corresponding allyl sulfides in excellent yields. ZrO2-Supported gold nanoparticles showed excellent catalytic turnover and reusability. In addition, the C–O bonds of benzyl and propargyl phosphates underwent thioetherification to afford benzyl and propargyl sulfides. The reaction of
In Silico Prioritization, Synthesis and In Vitro Evaluation of Tembamide Analogs for Anti-HIV Activity
作者:Shiv Gupta、Sanjay Kumar、Nisha Jariwala、Deepali Bhadane、Kamlesh Kumar Bhutani、Smita Kulkarni、Inder Pal Singh
DOI:10.2174/1570180814666170419115526
日期:2017.10.31
evaluation of their anti-HIV-1 activity is shown. Methods: In silico anti-HIV lead prioritization was performed on a set of known anti-HIV natural products in order to obtain a lead with better druglikeness and ADMET properties. Prioritized lead tembamide and its four analogs were synthesized and their anti-HIV-1 activity was evaluated. Results: Tembamide was found to be a lead with better QED, absorption
The first method for cyano-phosphorylation of aldehydes with diethyl cyanophosphonate in the presence of N-heterocyclic carbene prepared from 1,3-bis(2,4,6-trimethylphenyl)imidazolium chloride and KOt-Bu, as a nucleophilic catalyst, is described.
IMPROVED SYNTHESIS OF CYANOHYDRIN PHOSPHATES AND ITS REACTION MECHANISM
作者:Enxue Shi、Junhua Xiao、Chengxin Pei
DOI:10.1080/10426500490463501
日期:2004.7.1
Cyanohydrin phosphates 2a–2c were prepared in high yield from ketones (or aldehyde), diethylphosphorochloridate, and sodium cyanide by using acetonitrile as solvent. GC analysis proved that the two reactions of cyanohydrin sodium with diethylphosphorochloridate and with diethyl phosphorocyanidate resulted in the formation of cyanohydrin phosphates.