Chiral eighteen-component three-dimensional supramolecular entities stabilized by the hydrogen bonding and coordination interactions
作者:Shi-Gui Chen、Yong-Chun Fu、Gui-Tao Wang、Guang-Yu Li、Yuguo Ma、Xi-Kui Jiang、Zhan-Ting Li
DOI:10.1016/j.tet.2010.04.009
日期:2010.6
class of chiral eighteen-component three-dimensional supramolecular entities has been assembled in toluene and chloroform from twelve zinc porphyrin-appended 2-(ethylamino)- pyrimido[4,5-b][1,8]naphthyridin-4(3H)-one monomers and six chiral bipyridyl compounds. The heterocyclic segments form two C6-symmetric cyclic hexamers, which are stabilized by a well-established DDA–AAD hydrogenbonding motif, while
从十二个卟啉锌加成的2-(乙基氨基)-嘧啶[4,5- b ] [1,8]萘啶-4(3 )在甲苯和氯仿中组装了一类新的手性十八组分三维超分子实体H)一单体和六种手性联吡啶化合物。杂环链段形成两个C 6对称的环状六聚体,它们由成熟的DDA-AAD氢键基序稳定,而六个手性双吡啶配体与相应的卟啉锌单元配位,形成两层结构。该结构的特点是11 H NMR,UV-vis和圆二色性实验也表明,当单体的浓度足够高时,手性超分子实体可以排他地形成。
CHIRAL FLUORINATING REAGENTS
申请人:ISIS INNOVATION LIMITED
公开号:US20150284401A1
公开(公告)日:2015-10-08
This invention relates to fluorinating agents and, more particularly, to chiral non-racemic fluorinating agents useful for enantioselective fluorination, as well as to their synthesis and use and other subject matter. The fluorinating agents are based on a substituted 1,4-diazabicyclo[2.2.2]octane (DABCO) skeleton and provide electrophillic fluorine enantioselectively.
Discovery of brevijanazines from <i>Aspergillus brevijanus</i> reveals the molecular basis for <i>p</i>-nitrobenzoic acid in fungi
作者:Hang Li、Paul M. Mirzayans、Mark S. Butler、Alastair E. Lacey、Daniel Vuong、Rachel Chen、John A. Kalaitzis、Stephen A. Moggach、Ernest Lacey、Andrew M. Piggott、Yit-Heng Chooi
DOI:10.1039/d2cc01679f
日期:——
brevijanazines are novel p-nitrobenzoylated piperazines isolated from Aspergillus brevijanus. Their structures were elucidated by spectroscopic analysis, X-ray crystallography and totalsynthesis. Heterologous biosynthesis, precursor feeding and in vitro microsomal assays unveiled the biosynthetic pathway to the brevijanazines, featuring a cytochrome P450 oxygenase that converts p-aminobenzoic acid to p-nitrobenzoic