Studies on ketene and its derivatives. 84. Reaction of diketene with tetrazole derivatives.
作者:TETSUZO KATO、TAKUO CHIBA、MOHSEN DANESHTALAB
DOI:10.1248/cpb.24.2549
日期:——
Reaction of diketene with 5-phenyltetrazole (I) gave rise to 2-acetonyl-5-phenyl-1, 3, 4-oxadiazole (VII), and 3-(5-phenyl-1, 3, 4-oxadiazol-2-yl)-2, 6-dimethyl-4-pyrone (VIII). On the other hand, when this reaction was carried out in acetic acid with reflux, 2-methyl-5-phenyl-1, 3, 4-oxadiazole (IX) and 1, 1-diacetyl-2-benzoylhydrazine (X) were obtained. Reaction of diketene with 5-aminotetrazole (III) resulted in the formation of 7-methyltetrazolo [1, 5-a] pyrimidin-5 (8H)-one (XI).
Efficient Water Reduction with sp<sup>3</sup>
-sp<sup>3</sup>
Diboron(4) Compounds: Application to Hydrogenations, H-D Exchange Reactions, and Carbonyl Reductions
作者:Mathias Flinker、Hongfei Yin、René W. Juhl、Espen Z. Eikeland、Jacob Overgaard、Dennis U. Nielsen、Troels Skrydstrup
DOI:10.1002/anie.201709685
日期:2017.12.11
demonstrated by conducting a series of selective reductions of alkynes and alkenes, and hydrogen–deuteriumexchange reactions using two‐chamber reactors. Finally, as the water reduction reaction generates an intermediate borohydride species, a range of aldehydes and ketones were reduced by using water as the hydride source.
The title compounds 1 undergo a ring rearrangement with hydroxylamine, hydrazines and acidic aqueous medium leading to isoxazoles 3, pyrazoles 5-7 and pyrazolones 10, respectively. The structure of some title compounds reported in the literature are revised to the corresponding pyrazolones 10.