93033-57-9

Abstract: Regioselective synthesis of some novel 7-bromo-2H-benzo[b][1,4]oxazin-3(4H)-one linked isoxazole hybrids via copper(I) catalyzed one-pot reaction of various aromatic aldehydes with 7-bromo-4-(prop-2-yn-1-yl)-2H-benzo[b][1,4]oxazin-3(4H)-one was developed. The structures of the compounds that are synthesized are confirmed by 1H NMR, 13C NMR, and mass spectra. All the hybrids have been tested for their in vitro anticancer activity against four human cancer cell lines, including HeLa, MCF-7, A549, and PC3. Three of the compounds exhibited remarkable anticancer activity compared to standard drug etoposide. Molecular docking studies with EGFR also strengthened the in vitro anticancer activity.

In search of better antibacterial agents, a series of novel xanthine derived 3,5-disubstituted isoxazole derivatives were synthesized (3a-3j) in one-pot using 8-chloro-1,3-dimethyl-7-(prop-2-yn-1-yl)-1H-purine-2,6(3H,7H)-dione and aromatic aldehydes and f

A molecular I2-promoted one-pot synthesis of 2-aryl benzoxazoles has been developed by using amidoximes rather than the limited 2-aminophenols or 2-haloamides as substrates. The amidoxime substrates provided unique and efficient strategies for converting readily available aniline and benzaldehyde precursors into valuable chemicals. This transformation proceeded smoothly under transition-metal-free conditions through a sequential oxidative cyclization and ring contraction, and provided a potential route for introducing certain groups at any site of the scaffold.

Regioselective synthesis of some novel isoxazole-benzimidazole hybrids in high yields via Cu(I)-catalyzed tandem one-pot reaction of aromatic aldehydes with 1-prop-2-ynylbenzimidazole is developed. Structures of the synthesized compounds are confirmed by

A novel series of coumarin derivatives 6a–o, bearing isoxazole moieties were designed and synthesized. After that, they were evaluated for melanin synthesis in murine B16 cells and inhibitory effect on the growth of CA (Candida albicans), EC (Escherichia coli), SA (Staphylococcus aureus). It was found that eleven compounds (6b–f, 6j–o) showed a better activity on melanin synthesis than positive control (8-MOP). Among them, compounds 6d (242%) and 6f (390%), with nearly 1.6 and 2.6-fold potency compared with 8-MOP (149%) respectively, were recognized as the most promising candidate hits for further pharmacological study of anti-vitiligo. Seven halogen substituted compounds exhibited moderate antimicrobial activity against CA. It is interesting that 6e–f and 6l–m, which had two halogens on the benzene showed a comparable activity with Amphotericin B against CA. The evaluation of melanin synthesis in B16 cells and inhibitory effect on bacteria of above structurally diverse derivatives had also led to an outline of structure-activity relationship.

A new series of chalcone derivatives 1–18, bearing isoxazole moieties were designed and synthesized, and biologically evaluated for their activity on mushroom tyrosinase and melanin synthesis in murine B16 cells. The result indicated that most of prepared compounds 1–18 showed potent activating effect on tyrosinase, especially for 1–2, 4, 6–7, 9 and 15. Among them, compounds 2, 4 and 9 demonstrated the best activity with EC50?=?1.3, 2.5 and 3.0?μmol·L?1respectively, much better than the positive control 8-methoxypsoralan (8-MOP, EC50?=?14.8?μmol·L?1); In B16 cells, all the tested compounds exhibited a stronger activity on melanogenesis than 8-MOP (with the value of 115%). It was interesting that derivatives substituted with halogen (1, 2, 4, 5, 7, 9) were generally more potent. Compounds 2 (463%) and 18 (438%) with 3 and 4-fold potency compared with 8-MOP respectively, were recognized as the most promising candidate hits for further pharmacological study of anti-vitiligo.

Herbicidally and fungicidally active 5-oxy-substituted 3-phenylisoxazoline-5-carboxamides and 5-oxy-substituted 3-phenylisoxazoline-5-thioamides of the formula (I) are described. In this formula (I), X, X2 to X6, R1 to R4 are radicals such as hydrogen, halogen and organic radicals such as substituted alkyl. A is a bond or a divalent unit. Y is a chalcogen.