Acylsalicylic acids 1 can be converted by reaction with N-Phenylketeniminylidene triphenylphosphorane 2 into chromones 6 or 7.
乙酰水杨酸可通过与N-苯基烯酮亚胺基三苯基膦反应,转化为色酮6或7。
Ruthenium-NHC-Catalyzed Asymmetric Hydrogenation of Flavones and Chromones: General Access to Enantiomerically Enriched Flavanones, Flavanols, Chromanones, and Chromanols
作者:Dongbing Zhao、Bernhard Beiring、Frank Glorius
DOI:10.1002/anie.201302573
日期:2013.8.5
Two to four! Readily available flavones and chromones were efficiently converted into four valuable chiral classes of O‐heterocycles—flavanones, chromanones, flavanols, and chromanols—by means of an enantioselective Ru/NHC‐catalyzed hydrogenation process (see scheme; NHC=N‐heterocyclic carbene, PCC=pyridinium chlorochromate).
Es werden drei Wege der Synthesevon 2-Carbonylchromonen beschrieben: Oxydation von 2-Alkylchromonen mit SeO2, resp. CrO3; Spalten der Nitrone, resp. Anile von 2-Alkylchromonen; Spalten der Isonitrosoverbindungen von 2-Alkylchromonen.
Es werden drei Wege der Synthese von 2-Carbonylchromonenmitschöben:氧化von 2-Alkaylchromonen mit SeO 2,分别。CrO 3 ; Spalten der Nitrone,分别。Anile von 2-Alkaylchromonen; Spalten der Isonitrosoverbindungen von 2-Alkylchromonen。
Unified Approach to (Thio)chromenones via One-Pot Friedel–Crafts Acylation/Cyclization: Distinctive Mechanistic Pathways of β-Chlorovinyl Ketones
作者:Hun Young Kim、Eunsun Song、Kyungsoo Oh
DOI:10.1021/acs.orglett.6b03348
日期:2017.1.20
method to chromenones and thiochromenones has been developed using a one-pot Friedel–Craftsacylation of alkynes with suitably substituted benzoyl chlorides. This unified approach to (thio)chromenones is readily applicable to aryl- and alkylalkynes where the stereochemically well-defined β-chlorovinyl ketone intermediates undergo distinctively different cyclization pathways. The ready availability
Synthesis of substituted 2<i>H</i>[1]benzopyrans from coumarins and chromones
作者:A. Alberola、A. González Ortega、R. Pedrosa、J. L. Pérez Bragado、J. F. Rodríguez Amo
DOI:10.1002/jhet.5570200341
日期:1983.5
A convenient route to substituted 2H[1]benzopyrans is described in which trialkylaluminium compounds are added to coumarins or chromones and the resultant Z-2-(3-hydroxy-1-propenyl)phenols are converted by thermal cyclization in the presence of silica gel to 2H[l]benzopyrans.
描述了一种取代2 H [1]苯并吡喃的简便方法,其中将三烷基铝化合物添加到香豆素或色酮中,并在二氧化硅存在下通过热环化反应将生成的Z -2-(3-羟基-1-丙烯基)苯酚转化凝胶至2 H [1]苯并吡喃。