A convenient one-pot two-step synthesis of pyrazolylphosphonates from ethynylphosphonate
作者:Alexander Yu. Mitrofanov、Irina P. Beletskaya
DOI:10.1016/j.mencom.2021.07.033
日期:2021.7
A convenient one-pot preparation of pyrazol-3-ylphosphonates involves Cu-catalyzed cross-coupling of acyl chlorides with diethyl ethynylphosphonate followed by heterocyclization with hydrazine.
Denitrogenative dismantling of heteroaromatics by nucleophilic substitution reactions with diazomethyl compounds
作者:Soumen Biswas、Claire Empel、Luis Mario Sanchez-Palestino、Hadi Arman、Rene M. Koenigs、Michael P. Doyle
DOI:10.1039/d4sc01578a
日期:——
Nucleophiles from deprotonation of diazomethyl compounds having diverse electron withdrawing groups react with 4-carboxylato-1,2,3-triazines at the 6-position to extrude dinitrogen and produce diazovinylketoesters compounds with five or six linear contiguous sp2-hybridized carbons, whereas these same nucleophiles react with 4-carboxylato-1,2,3-triazine 1-oxides, also at the 6-position, to form pyrazolines