作者:Jason P. Safko、Robert D. Pike
DOI:10.1007/s10870-012-0346-1
日期:2012.9
The structure of 1,4-diphenylpiperazine (1) was determined; it crystallized in the orthorhombic space group Pbca, a = 8.6980(7), b = 8.4287(7), c = 17.6359(15), V = 1292.94(19), Z = 4. Three novel N,N′-disubstituted piperazines were synthesized via reductive amination of piperazine or N-diphenylmethylpiperazine. The products were characterized by NMR and X-ray crystallography. 1,4-Diphenethylpiperazine (2) crystallized in the monoclinic space group C2/c, a = 17.9064(13), b = 6.2517(5), c = 14.9869(11), β = 90.613(4), V = 1677.6(2), Z = 4. 1-Benzhydryl-4-benzylpiperazine (3) crystallized in the monoclinic space group Pn, a = 5.9450(2), b = 19.0722(4), c = 8.6084(2), β = 96.4600(10), V = 98.1790(10), Z = 2. 1-Benzhydryl-4-(pyridin-2-ylmethyl)piperazine (4) crystallized in the monoclinic space group P2/c, a = 13.5637(2), b = 5.82170(10), c = 24.0645(4), β = 90.613(4), V = 1888.16(5), Z = 4. Comparison of the structures showed significant sp2 character for the piperazine nitrogen atoms in 1. Each structure showed multiple intermolecular non-bonding interactions. The structures of 1,4-diphenylpiperazine, diphenethylpiperazine, 1-benzhydryl-4-benzylpiperazine, and 1-benzhydryl-4-(pyridin-2-ylmethyl)piperazine are reported.
1,4-二苯基哌嗪(1)的结构已被确定;它在正交晶系空间群 Pbca 中结晶,参数为 a = 8.6980(7)、b = 8.4287(7)、c = 17.6359(15),体积 V = 1292.94(19),Z = 4。通过对哌嗪或 N-二苯甲基哌嗪进行还原胺化合成了三种新型的 N,N′-二取代哌嗪。产物通过核磁共振(NMR)和X射线晶体学进行表征。1,4-二苯乙基哌嗪(2)在单斜晶系空间群 C2/c 中结晶,参数为 a = 17.9064(13)、b = 6.2517(5)、c = 14.9869(11)、β = 90.613(4),体积 V = 1677.6(2),Z = 4。1-苯基氢醯基-4-苄基哌嗪(3)在单斜晶系空间群 Pn 中结晶,参数为 a = 5.9450(2)、b = 19.0722(4)、c = 8.6084(2)、β = 96.4600(10),体积 V = 98.1790(10),Z = 2。1-苯基氢醯基-4-(吡啶-2-基甲基)哌嗪(4)在单斜晶系空间群 P2/c 中结晶,参数为 a = 13.5637(2)、b = 5.82170(10)、c = 24.0645(4)、β = 90.613(4),体积 V = 1888.16(5),Z = 4。结构比较显示 1 中哌嗪氮原子具有显著的 sp2 性质。每种结构显示出多个分子间非键合相互作用。报告了 1,4-二苯基哌嗪、二苯乙基哌嗪、1-苯基氢醯基-4-苄基哌嗪和 1-苯基氢醯基-4-(吡啶-2-基甲基)哌嗪 的结构。