(E)-2-(4-methoxybenzylidene)hydrazine carboxamide;(E)-semicarbazone of 4-methoxylbenzaldehyde;p-Anisaldehyd-Semicarbazon;[(E)-[(4-methoxyphenyl)methylidene]amino]urea;[(E)-(4-methoxyphenyl)methylideneamino]urea
Solvent-Free Green Synthesis of Azines and Their Conversion to 2,5-Disubstituted-1,3,4-thiadiazoles
摘要:
A solvent-free, clean, and efficient method has been developed for the synthesis of 2,5-disubstituted-1,3,4-thiadiazoles via azines. This approach exploits the synthetic potential of clean reactions and offers many advantages such as excellent product yields, easy isolation of products, and ecofriendly benign reaction conditions. The newly synthesized compounds were analyzed by infrared, H-1 NMR, C-13 NMR, and elemental analysis.
Regeneration of Carbonyl Compounds from Semicarbazones Under Microwave Irradiations
作者:Mukulesh Baruah、Dipak Prajapati、Jagir S. Sandhu
DOI:10.1080/00397919809458695
日期:1998.11
Abstract Semicarbazones 1 undergo facile cleavage to the corresponding carbonylcompounds 2 by bismuth trichloride under microwave irradiations in high yields.
Synthesis of aryl-hydrazones via ultrasound irradiation in aqueous medium
作者:Ana Cristina Lima Leite、Diogo Rodrigo de M. Moreira、Lucas Cunha Duarte Coelho、Frederico Duarte de Menezes、Dalci José Brondani
DOI:10.1016/j.tetlet.2007.12.103
日期:2008.2
The synthesis of aryl-hydrazones from aromatic aldehydes/ketones and hydrazides (semicarbazide, thiosemicarbazide and aminoguanidine) is described using aqueous medium (acid conditions) under ultrasoundirradiation with short reaction times (20–30 min), the reactions occurring at room temperature and giving rise to good to excellent yields of the products, along with the diastereoselectivities. The
CARO'S ACID SUPPORTED ON SILICA GEL, PART VIII: AN EFFICIENT AND SELECTIVE REAGENT FOR CONVERSION OF PHENYLHYDRAZONES AND SEMICARBAZONES TO THE CORRESPONDING CARBONYL COMPOUNDS
Deprotection of phenylhydrazones and semicarbazones to their parent aldehydes and ketones in high yields has been carried out using caro'sacid supported on silica gel as a selective oxidant under mild conditions.
An efficient and stereoselective approach to 14-membered hexaaza macrocycles using novel semicarbazone-based amidoalkylation reagents
作者:Anastasia A. Fesenko、Alexander N. Yankov、Anatoly D. Shutalev
DOI:10.1016/j.tetlet.2016.11.041
日期:2016.12
An efficient synthesis of hydrazones of 4-(3-oxobutyl)semicarbazides and 4-(3-oxobutyl)semicarbazones using novel semicarbazone-based amidoalkylation reagents, 1-arylidene-4-[(aryl)(tosyl)methyl]semicarbazides, has been developed. The synthesis involved reaction of the latter with the Na-enolate of acetylacetone, followed by a base-promoted retro-Claisen reaction and treatment of the obtained 4-(3