Synthesis and crystal structure of the N4-oxide of an hydroxybenzo[f]quinoxalin-6(5H)-one obtained by oxidative cleavage of beta-lapachone-quinoxaline
作者:Carlos Alberto De Simone、Roohelman Pontes Silva、Marilia O. F. Goulart、Raphael S. F. Silva、Ana Paula G. Lobato、Maria do Carmo F. R. Pinto、Antonio Ventura Pinto
DOI:10.1007/s10870-006-9097-1
日期:2006.9
The N4-oxide of the 5-(3-hydroxy-3-methylbutyl)-5-hydroxybenzo[f]quinoxalin-6(5H)-one was synthesized from beta-lapachone-quinoxaline by MCPBA oxidation and the crystal structure has been determined (C17H18N2O4), Mr=297.3, a=15.880(5), b=16.998(1), c=5.587(2) Å, V=1508.1(5) Å3, D x=1.31, space group P21212, Z=4, S=1.109 and R obs=0.06. The central ring of the molecule is in a twisted-boat conformation and the molecular packing is done through two intermolecular hydrogen bonds O–H···O [2.072(6)] and [2.177(5) Å], forming columns along the direction parallel to the c-axis.
以β-拉帕酮-喹喔啉为原料,通过MCPBA氧化合成了5-(3-羟基-3-甲基丁基)-5-羟基苯并[f]喹喔啉-6(5H)-酮的N4-氧化物,并确定了晶体结构(C17H18N2O4), Mr=297.3, a=15.880(5), b=16.998(1), c=5.587(2) Å, V=1508.1(5) Å3, D x=1.31, 空间群 P21212, Z=4 ,S=1.109,R obs=0.06。分子的中心环呈扭船构象,分子堆积是通过两个分子间氢键O–H···O [2.072(6)]和[2.177(5) Å]完成的,沿分子链形成柱状。方向平行于c轴。