Stereochemistry of Products of Reactions between 3-diazo-naphthalene-1,2,4-trione and β-dicarbonyl Compounds. Structure of ethyl 2-[(3-hydroxy-1,4-dioxo-1,4-dihydro-naphthalen-2-yl)-hydrazono]-3-phenyl-3-oxo-propionate
作者:Fernando de C. da Silva、Vitor F. Ferreira、Patrícia de O. Lopes、James L. Wardell、Solange M. S. V. Wardell
DOI:10.3184/030823409x440850
日期:2009.5
obtained from reactions of 3-diazonaphthalene-1,2,4-trione with β-diketones, R1C(O)CH2COR2, have been previously found to have high antibacterial activity. However, confirmation of the stereochemistry about the C=N bond could not be achieved by spectroscopic means for products having different R1 and R2 groups, thereby limiting the utility of the reaction. Full characterisation of the product isolated from
3-Hydroxy-2-[(R1CO)(R2CO)]C=NNH-1,4-naphthoquinones,由 3-diazonaphthalene-1,2,4-trione 与 β-二酮,R1C(O)CH2COR2 的反应获得,先前已发现具有高抗菌活性。然而,对于具有不同 R1 和 R2 基团的产物,无法通过光谱手段确认 C=N 键的立体化学,从而限制了反应的实用性。现在报告了从 3-diazonaphthalene-1,2,4-trione 与 PhC(O)CH2CO2Et 反应分离的产物的完整表征,从单晶 X 射线结构测定:产物,3-羟基-2-[ (PhCO)(EtCO2)]C=NNH-1,4-萘醌具有 (Z)-立体化学。由于优选与酯羰基氧形成更强的分子内 N-H-O 氢键而不是与酮氧形成较弱的氢键,因此获得 Z-异构体而不是 E 形式。较弱的 C-H-O 氢键将分子连接成柱状。建议其他