Enhanced synthesis of oxo-verdazyl radicals bearing sterically-and electronically-diverse C3-substituents
作者:Rebecca O. Fuller、Madeleine R. Taylor、Margot Duggin、Alex C. Bissember、Allan J. Canty、Martyna M. Judd、Nicholas Cox、Stephen A. Moggach、Gemma F. Turner
DOI:10.1039/d1ob01946e
日期:——
presence of strong electron-donating substituents and electron rich heterocycles, result in a significant reduction in yield during both the alkylation and ringclosure steps. This can, in part, be alleviated by milder alkylation conditions and further substitution of the aryl group. In comparison, more facile formation of the tetrazine ring was observed with examples containing electron-withdrawing groups
A Hydrazine- and Phosgene-Free Synthesis of Tetrazinanones, Precursors to 1,5-Dialkyl-6-Oxoverdazyl Radicals
作者:Matthew Bancerz、Beom Youn、Matthew V. DaCosta、Michael K. Georges
DOI:10.1021/jo300027b
日期:2012.3.2
A complementary approach to published synthetic methods for tetrazinanones, precursors to verdazyl radicals, is described herein. This approach uses carbohydrazide, a commercially available reagent, as a common starting material. Unlike previous methods described in the literature, this synthetic scheme does not rely on phosgene, phosgene substitutes, or the limited pool of commercially available monosubstituted