Abstract Our investigations on the oxidative possibilities of the hypervalentiodine(III) reagent established that phenyliodine(III)bis(trifluoroacclate) (PIFA) can provide one-pot contiguous coupling-cyclization reaction giving a product with narwedine skeleton, when used in a phenolic couplingreaction of p'-bromonorbelladine derivatives. A suitably selected precursor gave up to 60% yield of the
摘要 我们对高价碘 (III) 试剂的氧化可能性的研究确定,苯基碘 (III) 双(三氟乙酸盐)(PIFA)可以提供一锅连续偶联环化反应,生成具有 narwedine 骨架的产物,当用于酚类化合物时p'-溴单甲萘醌衍生物的偶联反应。A suitably selected precursor gave up to 60% yield of the coupled product.
A concise, scaleable synthesis of narwedine
作者:David A. Chaplin、Neil Fraser、Peter D. Tiffin
DOI:10.1016/s0040-4039(97)10050-8
日期:1997.11
A concise, scaleablesynthesis of narwedine from 3,4-dimethoxybenzaldehyde is described. The procedure features a simple modification to the Barton phenolic coupling route.
Belladine N-oxides active against influenza A virus have been synthetized by a novel laccase-catalyzed 1,4-dioxane-mediated oxidation of aromatic and side-chain modified belladine derivatives. Electron paramagnetic resonance (EPR) analysis confirmed the role of 1,4-dioxane as a co-oxidant. The reaction was chemo-selective, showing a high functional-group compatibility. The novel belladine N-oxides
Laccase-mediated intramolecular oxidative radical coupling of N-formyl-2-bromo-O-methylnorbelladine afforded a novel and isolable spirocyclohexadienonic intermediate of galantamine. High yield and conversion of substrate were obtained in the presence of the redox mediator 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO). This laccase procedure, with an overall yield of 34%, represents a scalable and environmentally