5-Hexylidene-4-propylamino-1,5-dihydroimidazol-2-one formed from Cu-catalyzed oxidation with implication for the structure of a His-Lys cross-link

Cu-catalyzed oxidation of 5-hexyl-1,3-dihydroimidazo-2-one (1) in the presence of propylamine, as surrogates for the oxidized His side chain and Lys side chain, was investigated. 5-Hexylidene-4-propylamino-1,5-dihydroimidazol-2-one (2), a model His-Lys cross-link product, was isolated and structurally characterized by NMR and mass spectrometry.

Xylyl derived oxacalixcrowns:Synthesis and crystal structure

Oxacalixcrowns 1， 2 和 3 经由 dihydroxyoxacalix 的反应被综合[2 ] arene [2 ] pyrazine 5 与 ortho- ， meta-bis(bromomethyl)benzenes 和帕拉二度(bromomethyl ) ，在 1:1 的苯塑造。1， 2 和 3 的结构和符合构造被 NMR，集体光谱学和单个水晶 X 光检查衍射分析的联合建立。

Synthesis of Pillar[n]arene[5−n]quinines via Partial Oxidation of Pillar[5]arene

An improved partial oxidation of 1,4-dimethoxypillar[5]arene(DMP[5])was described,through which selected pillar[n]arene[5−n]quinones,such as pillar[4]arene[1]quinone,pillar[3]arene[2]quinone,pillar[2]arene[3]quinone and pillar[1]arene[4]quinone,were synthesized by manipulating the ratio of oxidative reagent(NH4)2[Ce(NO3)6]to DMP[5].

Synthesis and structures of malonate derivative-calix [4] arene conjugates

A series of malonate derivatives-calix[4]arene conjugates were synthesized through Knoevenagel condensation reaction between formyl-tetrapropoxycalix[4]arene and malonate derivatives. The structures of the resulting malonate derivative functionalized calix[4]arenes were characterized by NMR spectroscopy, mass spectrometry and even single crystal X-ray diffraction analysis.