3367-54-2Relevant academic research and scientific papers
Piperazine derivative and organic photoelectric device comprising same
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Paragraph 0102-0106; 0114-0118; 0125-0129; 0136-0140; 0169, (2021/08/25)
The invention provides a piperazine derivative, an organic photoelectric device containing the same, and a piperazine derivative for improving the light-emitting utilization and-color purity of the organic light-emitting device. The organic light emitting device of the cover layer material provided by the invention can realize high light emission efficiency and color purity, and the organic light emitting element can be used for an organic EL display. A light source such as lighting, a marking plate, an identification lamp and the like. The invention provides an organic light emitting device which greatly improves the light emitting utilization rate and has excellent color purity. The present invention is characterized by the following general formula (1). Specific chemical structures and device performance are described in detail in the specification.
Preparation method of posaconazole intermediate 1-(4-aminophenyl)-4-(4-hydroxylphenyl)piperazine
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Paragraph 0032-0033, (2020/07/15)
The invention discloses a preparation method of a posaconazole intermediate, namely 1-(4-aminophenyl)-4-(4-hydroxylphenyl)piperazine, belonging to the field of medicinal chemistry. The preparation method comprises the following steps: S1, with chlorobromobenzene and anhydrous piperazine as raw materials, generating 1,4-bis(4-chlorophenyl)piperazine under certain conditions; S2, performing single-side methylation on the product generated in the step S1 to obtain 1-(4-methoxyphenyl)-4-(4-chlorophenyl)piperazine; S3, performing ammoniation on the product in the step S2 to obtain 1-(4-methoxyphenyl)-4-(4-aminophenyl)piperazine; and S4, demethylating the product obtained in the step S3, and carrying out crystallizing and purifying to obtain the 1-(4-aminophenyl)-4-(4-hydroxylphenyl)piperazine.The raw materials used in the preparation method are very cheap; reaction conditions are relatively simple; the method is easy to implement; yield is high; and the cost of a final product can be obviously reduced.
Nickel-catalysed selective N-arylation or N,N′-diarylation of secondary diamines
Brenner, Eric,Schneider, Rapha?l,Fort, Yves
, p. 6913 - 6924 (2007/10/03)
The selective synthesis of N-aryl or N,N′-diaryl piperazines and trimethylene(bis)piperidines from the corresponding diamines and aryl chlorides using a catalyst combination of Ni(0) associated to 2,2′-bipyridine is described. The Ni/2,2′-bipyridine catalyst is also effective for the sequential arylation of piperazine. The preparation of novel and unsymmetrical 1,4-diaryl piperazines is reported.
