Synthesis and Pesticidal Properties of Thio and Seleno Analogs of Some Common Urea Herbicides

Selenium‐Mediated Cyclization Reaction of 2‐Vinylanilines with/without Isonitriles: Efficient Synthesis of 2‐Aminoquinoline/ 3‐Aryl‐1H‐indole Derivatives

“…Therefore, we used the reduced‐Se to perform reactions listed in Scheme and Scheme . Then, we used 2 a and Se to synthesize isoselenocyanate 5 ,– which was treated with 1 a to give the desired product 3 a in 87% yield. Alternatively, the intermediate 5 could be reacted with 1 a in situ without isolation also smoothly giving 3 a (Scheme —, yield in brackets).…”

“…Meanwhile, Se captured by isocyanide 2 a and obtained the intermediate 5 under the action of the base. The intermediate 5 attacked 2‐vinylarylamine 1 a to form intermediate 6 , cyclized, released K 2 Se or H 2 Se, and obtained the target product 3 a . According to the experimental phenomena and the physical and chemical properties of K 2 Se or H 2 Se, which will release the elemental Se in wet and heat environments, and Se will enter the cycle again.…”

Synthesis of selenoureas and heterocycles based thereon

“…In recent time, various efficient procedures for their preparation have been developed. One of the most efficient and convenient procedure for the synthesis of selenoureas 1 in high yield is based on the reaction of aryl and alkyl isoselenocyanates 2 with various primary and secondary amines [61][62][63][64][65][66][67][68][69][70]. N-Acyl selenoureas 5 can be obtained by reaction of amines with acyl isoselenocyanates 4 which are prepared in turn from acyl chlorides 3 and potassium selenocyanate [68,[71][72][73][74] (Scheme 1).…”

Diverse Derivatives of Selenoureas: A Synthetic and Single Crystal Structural Study

“…Isoselenocyanates are useful precursors for the synthesis of selenium-containing heterocycles or heteroatom compounds [ 1 , 2 , 3 ]. Although the isolatable aryl isoselenocyanates have been characterised spectroscopically and crystallographically [ 1 , 4 , 5 , 6 , 7 ], the unstable aroyl isoselenocyanates can be only characterised via their further reaction with primary and secondary amines leading to the formation of N -benzoylselenoureas [ 8 , 9 ], for example, the aroyl isoselenocyanates generated in situ can be trapped with ethyl diazoacetate 9 and diphenyldiazomethane [ 10 ]. The preparation of selenoureas is mainly carried out by reaction of isoselenocyanates with amines [ 11 , 12 ].…”