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HCl-catalyzed deprotection and cyclization of benzylic alcohol 15 cleanly provided tricycle 16 by a cis-selective intramolecular Diels–Alder reaction. Acetylation of the phenol, bis epoxidation, and base-catalyzed hydrolysis and cyclization afforded tetracycle 19 with the bisabosqual skeleton,...
The syntheses of cyclophosphodiesters of 5-C-(hydroxymethyl)-hexoses and hexitols and of 6-C-(hydroxymethyl)-hexoses are reported, along with that of 6-deoxy- gluco -heptose 7-phosphate. These compounds proved to be reasonable substrate mimics and show inhibitory activity against human d - myo...
Extended cavity calix(4)pyrroles and a calix(6)pyrrole were synthesized by cyclization of 5-methyl-5-(4-nitrophenyl)dipyrromethane with acetone in the presence of acid. The solid-state structures of the novel macrocycles were determined by X-ray crystallography. The host–guest chemistry of...
The facile total synthesis of the (−)-Heliconol A ( ent - 1 ) as well as its diastereoisomer 18 is described, in which different reaction sequences lead to different results. The osmylation of 15 followed by hydrolysis afforded a single isomer 18 , otherwise, a mixture of ent - 1 and 18...
The reaction of bis(aroylmethyl) sulfides with aromatic aldehydes and ammonium acetate in 1:2:1 molar ratio under solvent-free microwave irradiation afforded predominantly a series of thiazoles, viz., 1-aryl-2-(5( Z )-5-arylmethylidene-2,4-diaryl-2,5-dihydrothiazol-2-yl)ethanones...
The biological properties of disubstituted 2,5-diketopiperazines and the corresponding synthetic procedures that allow the generation of large arrays of derivatives with interesting biological applications are described.
We report herein the synthesis of a novel modified steroid with two rigidly positioned amino acids in C - and N -protected forms (Gly–O t Bu and N -Fmoc– l -Phe) at the angular positions (C-18 methylamino group and C-19 carboxylic function) of the steroid nucleus via amide bonds, starting...
A series of 2 H -pyrano(3,2- c )chromen-5-one derivatives were synthesized and characterized. Their photochromic and redox properties were investigated by the UV–vis absorption spectroscopy. While compounds with one or two phenyl groups incorporated at the 2-position were present in both...
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