Substituent controlled reactivity switch: selective synthesis of α-diazoalkylphosphonates or vinylphosphonates via nucleophilic substitution of alkyl bromides with Bestmann–Ohira reagent
作者:Mukund M. D. Pramanik、Atul Kumar Chaturvedi、Namrata Rastogi
DOI:10.1039/c4cc05684a
日期:——
We report a substituent controlled nucleophilic displacement of alkyl bromides with Bestmann–Ohira reagent yielding either dimethyl diazoalkylphosphonates or (E)-vinylphosphonates.
Switchable Synthesis of 3-Substituted 1<i>H</i>-Indazoles and 3,3-Disubstituted 3<i>H</i>-Indazole-3-phosphonates Tuned by Phosphoryl Groups
作者:Guihua Chen、Minglin Hu、Yungui Peng
DOI:10.1021/acs.joc.7b02857
日期:2018.2.2
3-alkyl/aryl-3H-indazole-3-phosphonates were synthesized efficiently through a 1,3-dipolarcycloadditionreaction between α-substituted α-diazomethylphosphonates and arynes under simple reaction conditions. The product distribution was controlled by the phosphoryl group, which acted both as a tuning group and a traceless group in the reaction.