One-Pot Synthesis Using Supported Reagents System: Conversion of β-Dicarbonyl Compounds to α-Thiocyano-β-dicarbonyl Compounds Using CuBr<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>-KSCN/SiO<sub>2</sub>
作者:Yoshitada Suzuki、Mitsuo Kodomari
DOI:10.1246/cl.1998.1091
日期:1998.11
Transformation of β-dicarbonylcompound 1 to α-thiocyano-β-dicarbonyl compounds 3 in one-pot was achieved by using supported reagents system CuBr2/Al2O3-KSCN/SiO2, in which 1 reacts first with CuBr2/Al2O3 and the product, α-bromo-β-dicarbonyl compound 2 reacts with KSCN/SiO2 to give the final product 3 in good yield.
Synthesis of C60-fused tetrahydrothiophene derivatives via nucleophilic cycloaddition of thiocyanates
作者:Guan-Wu Wang、Jia-Xing Li、Yu Xu
DOI:10.1039/b807394e
日期:——
Nucleophilic cycloaddition of thiocyanates 1a–e with C60 in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene afforded C60-fused 2-iminotetrahydrothiophene derivatives 2a–e and methanofullerenes 3a–d. The product distributions were highly sensitive to the substrates employed. The 2-iminotetrahydrothiophene derivatives 2a–e could be further manipulated by hydrolysis and acetylation to give 2-oxotetrahydrothiophene derivatives 4a–e and 2-acetamidotetrahydrothiophene derivatives 5a–e. A possible reaction mechanism for the formation of products 2a–e and 3a–d was proposed.
Pseudohalogen chemistry. XI. Some aspects of the chemistry of α-thiocyanato-β-dicarbonyl compounds
作者:Elaine F. Atkins、Steven Dabbs、Robert G. Guy、Akbar A. Mahomed、Philip Mountford
DOI:10.1016/s0040-4020(01)85248-0
日期:1994.1
Enolised α-thiocyanato-β-dicarbonyl compounds dimerise in ethanol at room temperature to give tautomeric 4,5-disubstituted 2-amino- and 2-acetamido-thiazoles by a C-S-C + C-N cyclisation. Tautomerism is due to the unusual 4-(β-dicarbonyl-α-thio) substituent. Competing intramolecular cyclisations lead to minor amounts of heterocycles containing the thiazole and/or oxathiole ring systems
A convenient, rapid, and general synthesis of α-oxo thiocyanates using clay supported ammonium thiocyanate
作者:H.M. Meshram、Pramod B. Thakur、B. Madhu Babu、Vikas M. Bangade
DOI:10.1016/j.tetlet.2012.01.113
日期:2012.4
A very rapid, convenient, and general method for the synthesis of alpha-oxo thiocyanates has been described by using clay supported ammonium thiocyanate. The procedure avoids the use of additional catalyst, solvent, aqueous work-up and the yields are high. Moreover, the method is applicable for a variety of aryl, heteroaryl, alkyl alpha-halo carbonyls, beta-keto tosylates, alpha-halo beta-dicarbonyl, alpha-tosyl, beta-dicarbonyl, alkyl halide, and alkyl tosylates. (C) 2012 Elsevier Ltd. All rights reserved.