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ZHANG Lan-ping WANG Ya-lou 《高等学校化学研究》2010,(2):245-248
5-Hydroxy-2-(2-phenylethyl)chromone(1) was synthesized from 2,6-dihydroxyacetophenone(7) obtained via four-steps resorcinol-reacting with phenylpropionic acid,the procedures involved are Baker-Venkataraman rearrangement and cyclization which are easy to conduct,the overall yield is 32%. 相似文献
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β-Hydroxy-a-amino acids are an important class of amino acids due to their inherent biological investigations[1] and as structural components of more complex biomolecules.[2] β-Hydroxy-a-amino acids have been used as intermediates in the asymmetric synthesis of other compounds.[3] An efficient and convenient concise method for the preparation of optically pure enantiomers of β-hydroxy-α-amino acids would be of general interest. 相似文献
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A new and facile synthesis of O2PtF6 is reported without the demanding synthesis of PtF6 or the use of high pressure fluorination in the presence of oxygen. The O2PtF6 is obtained in form of single crystals by direct Klemm‐type fluorination of commercially available PtO2 · xH2O in a stream of diluted F2 of atmospheric pressure at a temperature of 275 °C. Its identity and purity was evidenced by powder X‐ray diffraction, Raman and infrared spectroscopy. The synthesis allows the preparation of pure dioxygenyl hexafluoridoplatinate(V). The new synthesis of O2PtF6 is deemed more convenient than those that require the extremely reactive PtF6. 相似文献
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Russian Journal of Organic Chemistry - A substituted quinoline-6-carbohydrazide was synthesized by the reaction of ethyl 4-hydroxy-2-methylquinoline-6-carboxylate with hydrazine hydrate. The... 相似文献
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A synthesis of 2-aminonicotinaldehyde (1) which does not require chromatography and is easily scaled up has been developed. Bromination of 2-amino-3-picoline, protected as a phthalimide (4), produced the gem-dibromide (5), which was reacted with Nh4OH. The imine intermediate (7) was hydrolyzed with acid, producing (1) in a 56% conversion from 4. 相似文献
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Abstract: Novel 8-hydroxy-4-oxochroman derivatives were prepared from appropriate 4-chromanones via the Baeyer-Villiger oxidation followed by an intramolecular Fries rearrangement. 相似文献
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The hexamethylenetetramine/trifluoroacetic acid system was demonstrated to be capable of introducing three aldehyde groups into the phenol molecule. Facile, one-step procedures were developed for the preparation of hitherto difficult to synthesize 2-hydroxy-1,3,5-benzenetricarbaldehyde starting from either phenol or 4-hydroxybenzaldehyde. New pKa measurements showed 2-hydroxy-1,3,5-benzenetricarbaldehyde to be an acid stronger than previously reported. 相似文献
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Clive L. Branch Drake S. Eggleston R. Curtis Haltiwanger Arun C. Kaura John W. Tyler 《合成通讯》2013,43(11):2075-2084
The title compound has been prepared in three steps from 2-methylthiosemicarbazide following acylation, cyclisation and cation exchange chromatography. It was fully characterised by the usual spectroscopic means as well as by 15N nmr spectroscopy and X-ray crystallographic analysis. 相似文献
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4-Hydroxy-3-methoxycarbonyl-2-methyl-2H-1,2-benzothiazine 1,1-dioxide (8) was synthesized by a one-pot procedure, starting from the readily available saccharine. The synthesis involves 4 transformations with an overall yield equivalent to that from the stepwise process. 相似文献
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The synthesis and characterisation of some new 1,5-benzodiazepines prepared from 4,6-diacetylresorcinol is reported. 相似文献
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A new, simple and short route to 2-alkylcyclopent-2-enones starting from inxpensive terminal epoxides is described. 相似文献