52039-28-8

Upstream product

• 100-42-5 styrene 
• 536-74-3 phenylacetylene 
• 57988-22-4 (2-Chloro-2-phenylthiovinyl)-phenyl-keton 
• 4187-87-5 1-Phenyl-2-propyn-1-ol 
• 3876-61-7 1-benzoyl-2-bromoacetylene 
• 83239-25-2 (Z)-3-Chloro-3-ethylsulfanyl-1-phenyl-propenone 
• 10508-57-3 3-bromo-1-phenyl-prop-2-yn-1-ol 

Downstream Products

• 52039-55-1 1-phenyl-3-(4-phenyl-6-thioxo-6H-[1,3]thiazin-2-yl)-urea 
• 97310-09-3 4-Phenyl-1,3-thiazin-2,6-(3H)-dithion 
• 52039-54-0 N,N-dimethyl-N'-(4-phenyl-6-thioxo-6H-[1,3]thiazin-2-yl)-formamidine 
• 52039-53-9 2-acetylamino-4-phenyl-[1,3]thiazine-6-thione 

Relevant academic research and scientific papers

Access to gem-Dibromoenones Enabled by Carbon-Centered Radical Addition to Terminal Alkynes in Water Solution

We herein report a novel and more practical approach to prepare gem-dibromoenones from terminal alkynes, tetrabromomethane (CBr4), and water in a single step. Mechanistic studies reveal that the generation of a tribromomethyl radical with the assistance of a persulfate salt (K2S2O8) is essential to this transformation. The reaction features readily available chemicals, a broad substrate scope, a green solvent, and mild reaction conditions, providing an efficient alternative for construction of halogen-substituted enones.

Synthesis of substituted 2-amino-1,3-thiazine-6-thiones

The reaction of thiourea with 1-acyl-2-bromoacetylenes in AcOH in the presence of BF3 · Et2O affords 2-amino-4-phenyl(2-thienyl)-1,3-thiazine-6-thiones in high yields.

SYNTHESE VON 1,3-THIAZINIUMSALZEN AUS β-CHLORVINYLKETONEN UND THIOAMIDFUNKTIONELLEN VERBINDUNGEN

Thiocarbamoyl compounds A (aliphatic and aromatic thioamides, thioureas, dithiocarbamates, thiosemicarbazones etc.) and β-chlorovinyl-ketones B react to 1,3-thiazinium salts D (1-51) via S-ketovinyl-thioimidium derivatives C.The heterocyclizations are eas