one-step synthesis of thiocyanates through C–O bond cleavage of readily available alcohols with ammonium thiocyanate as the thiocyanating agent was developed. The method avoids the use of additional catalyst, and a variety of (hetero)arene, alkene and aliphatic alcohols reacted with high efficiency in ethyl acetate under mild conditions to afford the corresponding thiocyanates in excellent to quantitative
Substitution Reaction of Organic Halide by Trimethylsilyl Isothiocyanate: Formation of Thiocyanate and Its Rearrangement to Isothiocyanate
作者:Kozaburo Nishiyama、Makoto Oba
DOI:10.1246/bcsj.60.2692
日期:1987.7
The reaction of organic halide with trimethylsilyl isothiocyanate (TMSTC) gave thiocyanate 1 and its isomerized isothiocyanate 2. Details of the substituion and the isomerization reactions were examined.
Benzyl thiocyanates with an electron-withdrawing group (1a, 1b) and 9-fluorenyl thiocyanate (1e) rearrange to the corresponding isothiocyanate (2) under 9,10-diphenylanthracene (DPA) sensitization. The rearrangement would proceed via carbon–sulfur bond cleavage in an anion radical of 1 produced by photoinduced electron transfer, followed by back electron transfer to DPA·+ and recombination of the resulting
A divergent photoinduced selective synthesis of thiocyanate and isothiocyanate derivatives from readily available carboxylicacids was developed using N-thiocyanatosaccharin and a catalytic amount of base or acid. This molecular editing strategy allowed the functionalization of bioactive compounds. A mechanism for the transformation was proposed based on control experiments.
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.