The title compound, C(12)H(14)O(4), is an important inter-mediate in the synthesis of biologically active heterocyclic compounds. In the crystal structure, inter-molecular O-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules. There are also C-H⋯π contacts between the benzene ring and the methyl-ene groups.

The mol-ecule of the title heterocyclic compound, C(16)H(17)N(3)O(3)S, is bent at the S atom with an C-SO(2)-NH-C torsion angle of 80.17 (8)°. The phenyl substituent at the S atom is rotated out of the plane of the 1H-indazole ring [inter-planar angle = 46.24 (8)°]. In the crystal, inter-molecular N-H⋯N and N-H⋯O hydrogen bonds build up a ribbon developing parallel to the b-axis direction. C-H⋯...

We report a synthetic methodology for the construction of the fused heterocyclic compounds pyrido[2,1-b]quinazolin-9(1H)-ones and pyrrolo[2,1-b]quinazolin-9(1H)-ones through an AgOTf-catalyzed intramolecular alkyne hydroamination reaction. The methodology is applicable to a wide scope of substrates and produces a series of fused quinazolinone heterocycles in good to excellent yields.

A new general methodology for the synthesis of various functionalized privileged oxygen heterocyclic scaffolds, viz. pyrones, coumarins, and benzannulated coumarins, is developed. The synthesis proceeds through carbanion-induced ring transformation of lactones with various methylene carbonyl compounds followed by DDQ-mediated unprecedented oxidative cleavage of oxaylidenes intermediates. Studie...

To study the effects of meat intake, including heterocyclic amine exposure, on the risk of breast cancer, we conducted a hospital-based case-control study involving 352 patients with breast cancer and 382 controls. A strong effect of red meat, total meat, beef, fried meat, and heterocyclic amine exposure was found, after controlling for potential confounders. The odds ratio for the highest quar...

Heterocyclic compounds have paying strong attention interest. Many different derivatives have been prepared and possess various type useful pharmacological activities. A lot of work has been done on five member heterocyclic triazole ring system. Different pharmacological activities of triazole ring and its derivatives have been observed. Triazole derivatives possess a wide range of pharmacologi...

A series of new mono-1,2,3-triazole derivatives of pyrimidine nucleobases were synthesized by one-pot copper(I)-catalyzed 1,3-dipolar cycloaddition reactions between N-1-propargyluracil and thymine, sodium azide and several benzyl halides. The desired heterocyclic compounds were obtained in good yields and characterized by NMR, IR, and high resolution mass spectrometry. These compounds were inv...

Thiazines are a group of heterocyclic organic compounds that are still largely unexplored for their pharmacological activities. There are different available methods for the synthesis of thiazine derivatives in the literature. In this review, we discuss available methods of thiazine preparation through green synthesis methods. Beside their synthesis, many thiazine derivatives are biologically a...

In the title mol-ecule, C(13)H(13)FN(2)OS, the heterocyclic ring adopts a slightly distorted flattened boat conformation, and the plane through the four coplanar atoms makes a dihedral angle of 87.45 (14)° with the benzene ring. The thione, acetyl and methyl groups lie on the opposite side of the heterocyclic mean plane to the fluorophenyl group, which has an axial orientation. N-H⋯O, N-H⋯S, C-...