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Eleven new diterpenoids: pimaranes (1,2), rosanes (3) abietanes (4–7), icetexanes (8), and rearranged icetexanes (9–11), together with fifteen known diterpenes (12–26) and two known sesquiterpenes (27,28) have been isolated from the roots and twigs of Premna obtusifolia. The structures of these compounds were elucidated on the basis of spectroscopic analysis and X-ray crystallographic data of 8 and...
In the present study, a new series of 3,6-disubstituted-1,2,4-triazolo-[3,4-b]-1,3,4-thiadiazoles (4aj) have been synthesized by condensing 3-substituted-4-amino-5-mercapto-1,2,4-triazoles (1a–b) with various 3-substituted-pyrazole-4-carboxylic acids (3a–e) in the presence of POCl3. The structures of newly synthesized compounds were characterized by elemental analysis, IR, 1H NMR, 13C NMR, and mass...
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