Benzofuro[3,2-f][1]benzopyrans: a new class of antitubercular agents
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The "naked sugar" (+)-(1R,4R)-7-oxabicyclo[2.2.1]hept-5-en-one ((+)-2) has been converted to D-lividosamine ((+)-i: 3-deoxy-D-glucosamine) and derivatives via (+)-2-chloro-2,3-dideoxy-5,6-O-iso-propylidene-D-arabino-hexono-1,4-lact one ((+)-33) and (4)-2-a ...
Lithium diisopropylamide in the presence of catalytic amts. of potassium tert-butoxide smoothly converts homoallyl or homobenzyl type ethers to dienes or styrenes. g,d-Unsatd. acetals give 1,3-dienyl ethers and 4-alkylidenetetrahydropyrans or dihydropyrans ...
Hexamethylenetetramine suberate is an organic compound presenting a one-dimensional modulation with strong satellite reflections between 123 and 300 K. Single-crystal X-ray intensities of main reflections and satellites up to fourth order have been measure ...
N-Protected tropenone derivs. I (R = CO2Me, CBZ, Ts) prepd. from the resp. pyrroles and tetrabromoacetone, were used as starting materials for desymmetrization by hydroboration of the C-C double bond. Hydroboration of I with (-)-(Ipc)2BH followed by oxidn. ...
Homonuclear helicates with rare-earth-metal(III) ions or heteronuclear derivatives with rare-earth-metal and aluminium or zinc centres are obtained in alkali-metal-templated selfassembly processes from isobutenylidene- bridged homoditopic bis(2-carb-Gamido ...
Derivatives of 7-oxabicyclo[2.2.l]hept-5-en-2-yl ("naked sugars") are readily available through Diels-Alder cycloaddition of furan to an appropriate dienophile. Several methods allow one to obtain these molecules in optically pure form. They have been used ...
In the presence of catalytic amts. of a fluoride source, O-trimethylsilyl enethers undergo condensation with acyl fluorides to afford O-enesters with high yields. The intermediates and final products are pure (Z) isomers if only one double bond is in conju ...
Anomalous variations of one-bond C-C scalar coupling constants are observed in going from trinorbornane-to trinorbornene-like structures. Most notably, a IO-Hz increase is observed in the coupling constant involving the C-atoms of the ethano branch facing ...
An improved method for the prepn. of Me2C:CFCO2Et is described. The two stereoisomers (E)- and (Z)-BrCH2CMe:CFCO2Et obtained by g-bromination are sepd. and can be individually converted into the corresponding phosphonates. The PO-ylides generated by a-depr ...
The new polyene 1,1-bis(3,5-dimethyl-2-furyl)ethene (11) was derived from 2,4-dimethylfuran. Its reaction with dienophiles such as maleic anhydride, benzoquinone or 1-cyanovinyl acetate generated exclusively Diels-Alder adducts (9-oxabicyclo[4.3.0]nona-1,7 ...
