Xinghua Ma

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In the latter part of the international financial crisis, comprehensive performance of listed companies directly affect the confidence, investment risk and the rate of return of investors in the stock market. With the methodology of factor analysis and cluster analysis, this article selected 10 key financial indicators of listed companies as evaluation(More)
The naturally occurring sugar mimetic alkaloids 1-deoxymannojirimycin (DMJ, 1) and 6-O-alpha-L-rhamnopyranosyl-DMJ (2) have each been prepared in a completely stereoselective manner from the cis-1,2-dihydrocatechol 3, itself obtained in enantiomerically pure form by microbial oxidation of chlorobenzene.
A series of 28 analogues of the phytotoxic geranylcyclohexentriol (-)-phomentrioloxin A (1) has been synthesized through cross-couplings of various enantiomerically pure haloconduritols or certain deoxygenated derivatives with either terminal alkynes or borylated alkenes. Some of these analogues display modest herbicidal activities, and physiological(More)
[reaction: see text] Reaction of N-methylindole (4) with 6,6-dibromobicyclo[3.1.0]hexane (5) in the presence of silver tetrafluoroborate affords conjugate 7 in 67% yield. This product can be readily elaborated to compounds 12b and 13b which embody the polycyclic frameworks associated with members of the hapalindole and fischerindole classes of alkaloids.(More)
Palladium[0]-mediated Ullmann cross-coupling of 1-bromo-2-nitrobenzene (1 R = H) and its derivatives with a range of beta-halo-enals, -enones, or -esters readily affords the corresponding beta-aryl derivatives, which are converted into the corresponding quinolines, 2-quinolones, phenanthridines, or 6(5H)-phenanthridinones on reaction with dihydrogen in the(More)
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