In the title compound, C(14)H(19)N(3)O(4), the perhydro-pyran ring adopts a chair conformation. An intra-molecular C-H⋯O hydrogen bond generates an S(6) ring motif. In the crystal packing, mol-ecules are linked by O-H⋯O hydrogen bonds, forming infinite chains along [100].

Reaction of thionyl chloride with 2-acetyl-1- benzenesulfonylpyrrole semicarbazone (6 c) gave 4 - (1- benzenesulfonyl-2 - pyrrolyl) - 1, 2, 3 -thiadiazole (lc). Selenium dioxide oxidation of 2-acetylpyrazine semicarbazone (10) in acetic acid afforded 4- (2-pyrazinyl) - 1, 2, 3- selenadiazole (4). Reaction of thionyl chloride with compound 10 gave 4- (2-pyrazinyl) - 1, 2, 3- thiadiazole (3)....

A novel stereocontrolled approach has been developed for the syntheses of tashiromine and epitashiromine alkaloids from cyclooctene β-amino acids. The synthetic concept is based on the azetidinone opening of a bicyclic β-lactam, followed by oxidative ring opening through ring C-C double bond and reductive ring-closure reactions of the cis- or trans-cyclooctene β-amino acids.

The current study involved synthesis of several new N-Substituted -
 3- chloro -2- azetidinones for 2,4-Diamino-6-phenyl-1,3,5-triazine by two
 steps. first step includes preparation Schiff bases (Al-A6) by
 condensation 2,4-Diamino-6-pheny]-1,3,5-triazine with many substituted
 aldehydes, then the second six azetidinone
 compounds (B1-B6) reaction acetyl chloride the&#...