1080-05-3Relevant articles and documents
A convenient and effective synthesis of 3-(3,5-dimethoxyphenyl)propanal
Nikas, Spyros P.,Thakur, Ganesh A.,Makriyannis, Alexandros
, p. 1751 - 1756 (2002)
A convenient and effective synthesis of 3-(3,5-dimethoxyphenyl) propanal, an important intermediate in the synthesis of various biologically active compounds is described.
First synthesis of dopamine and rotigotin analogue 2-amino-6,8-dimethoxy-1, 2,3,4-tetrahydronaphthalene
Yilmaz, Süleyman,G?ksu, Süleyman
, p. 1058 - 1065 (2014/04/03)
The title compound was synthesized starting from 3-(3,5-dimethoxyphenyl) acrylic acid in 11 steps with 30% total yield. The reaction sequence hydrogenation of acrylic acid, reduction of acid to alcohol derivative with LiAlH4, reaction of alcohol with CBr4/PPh3, substitution reaction of alkyl halide to nitrile derivative with NaCN, hydrolysis of nitrile with NaOH, cyclization reaction of acid with PPA to give 1-tetralone, α-carboxylation of tetralone with Me2CO 3 in the presence of NaH, reduction of ketone group with Et 3SiH, hydrolysis of ester, Curtius rearrangement of acid with diphenylphosphoryl azide followed by conversion to carbamate, and finally hydrogenolysis of carbamate afforded 2-amino-6,8-dimethoxy-1,2,3,4- tetrahydronaphthalene hydrogen chloride salt.
Stable isotope labeling pattern of resveratrol and related natural stilbenes.
Fronza, Giovanni,Fuganti, Claudio,Serra, Stefano,Cisero, Marco,Koziet, Joseph
, p. 2748 - 2754 (2007/10/03)
The stable isotope characterization of resveratrol 1 from Polygonum cuspidatum and of related natural stilbenes 11 and 12 obtained by hydrolysis of the corresponding glucosides 2 and 3 from Rheum is reported. The C(6)-C(2)-C(6) framework of suitably protected derivatives of 1, 2, and 3 has been degraded with ozone to the C(6)-C(1) aldehydes 4, 5, 9, and 10, retaining all hydrogen atoms of the precursors. The natural and synthetic derivatives are characterized and distinguished by natural abundance deuterium nuclear magnetic resonance studies. In the case of anisaldehyde 4 the two series show, as expected, the characteristic difference of the aromatic labeling. The formyl deuterium contents of 4 and 5 from resveratrol are remarkably different, seemingly reflecting the different enrichments existing between positions 3 and 2, respectively, of the phenylpropanoid precursor. The positional delta(18)O values of the extractive materials 1-3 were also determined. In this instance a selective deoxygenation procedure was adopted, leading from 1 to the products 6, 7, and 8. The delta(18)O values of the latter compounds reveal, respectively, those at position 4' and positions 3 and 5 of 1. Similarly, the phenolic products 11 and 12 were converted into 13 and 14. From the delta(18)O values of the single components it is possible to design a detailed map of the oxygen fractionations which characterizes the stilbenes 1-3. In particular, the oxygen present at position 4' of the phenylpropanoid moiety of 1-3 shows delta(18)O values of +11.5, +1.8, and +6.7 per thousand, respectively. Moreover, the phenolic oxygen atom at position 3' of rhapontin 3 shows a value of +11.7 per thousand. The data are compared with those previously obtained on structurally related compounds. These results show the utility of simple chemical degradations in the stable isotope characterization of structurally complex food components.