Synthesis of the Selective Neuronal Nitric Oxide Synthase (nNOS) Inhibitor 5,6-Dibromo-2′-demethylaplysinopsin
作者:Jonathan Sperry、Emily Boyd
DOI:10.1055/s-0030-1259913
日期:2011.4
The first synthesis of the selective neuronal nitric oxide synthase (nNOS) inhibitor 5,6-dibromo-2′-demethylaplysinopsin is described. The rare 5,6-dibromoindole moiety was constructed using a previously unused dibromination of an indole-3-carboxylate, the product of which was verified by X-ray crystallography. It was discovered the natural product was characterised as its trifluoroacetate salt in the isolation report.
本研究首次合成了选择性神经元一氧化氮合酶(nNOS)抑制剂 5,6-二溴-2′-去甲基芹菜苷(5,6-dibromo-2′-demethylaplysinopsin)。稀有的 5,6-二溴吲哚分子是利用以前未使用过的吲哚-3-羧酸二溴化物构建的,其产物通过 X 射线晶体学进行了验证。在分离报告中发现,该天然产物的特征为其三氟乙酸盐。
A Simple Conversion of Creatinine to Creatol via Creatinine Chloroamine
creatol (2-amino-1,5-dihydro-5-hydroxy-l-methylimidazol-4-one) (1b) via creatinine chloramine (2-N-chloroamino-1,5-dihydro-l-methylimidazol-4-one) (3a), without using protecting groups. The creatinine chloroamine exists in the 2-N-chloroamino form (3a) in aqueous solution, but in the solid state, X-ray crystal analysis shows that it has the 2-N-chloroimino structure (2-N-chloroimino-1,5-dihydro-1-methylimidazol-4-one)
Synthesis of novel 2-aminoimidazo[4,5-<i>b</i>]pyridines, including the thieno analogue of the cooked-food mutagen IFP
作者:Malin Björk、Spiros Grivas
DOI:10.1002/jhet.5570430116
日期:2006.1
compounds, including three new ring systems obtained via the Friedländer condensation of ortho-aminothiophenecarbaldehydes 11, 21 and 24 with creatinine (8), are reported. The condensation afforded 1, which is the thienoanalogue of the cooked-foodmutagenIFP (2-amino-1,6-dimethylfuro[2,3-e]imidazo[4,5-b]pyridine), and the benzothieno[2,3-e]- and benzothieno[3,2-e]imidazo[4,5-b]pyridines 2 and 3. Attempts
报道了八种新化合物,包括通过邻氨基噻吩甲醛11、21和24与肌酸酐的弗里德兰德缩合反应制得的三个新的环系(8)。缩合得到1,它是煮熟的诱变剂IFP(2-氨基-1,6-二甲基呋喃[2,3- e ]咪唑[4,5- b ]吡啶)和苯并噻吩并[2]的噻吩类似物。,3- e ]-和苯并噻吩并[3,2- e ]咪唑并[4,5- b ]吡啶2和3。尝试用异肌酐(12)缩合11。3的脱硫得到已知的熟食致癌物PhIP。据报道3的2-硝基(4)和2-羟基(5)衍生物。相关的2-氨基-1-甲基咪唑并[4,5- b]苯并噻吩(25)是通过不同的途径合成的。报告了所有新化合物的完全分配的1 H和13 C nmr数据。
Aplysinopsin-type alkaloids fromDendrophyllia sp., a scleractinian coral of the family dendrophylliidae of the philippines, facile photochemical (Z/E) photoisomerization and thermal reversal
The dendrophylliid Dendrophyllia sp. of Palawan contains the indole alkaloids 2′-demethylaplysinopsin (4) and 2′-demethyl-3′-N-methylaplysinopsin (6) and their 6-bromo analogues in H (Z/E) ratio larger than 95:5; these mixtures undergo facilephotoisomerization to give mixtures richer in the (E) stereoisomer which undergo thermal isomerization to give back the original mixtures.
The marine natural product leucettamine B 2 has been prepared in good yield via two different routes, starting with glycine or with 3-methyl thiohydantoin, involving simple aldol condensation, and finally transamination of the thiohydantoin derivative. (C) 1999 Elsevier Science Ltd. All rights reserved.