This paper describes the direct synthesis of pyrazoles fromesters that comprises two sequential reactions: tert-butoxide-assisted C-C(=O) coupling reaction to yield [small beta]-ketonitrile or [small alpha],[small beta]-alkynone intermediates, and condensation by hydrazine addition....
efficient catalytic asymmetric Michael-type reaction of azonaphthalenes with 5-aminoisoxazoles has been developed. The reaction was based on the utilization of a chiralphosphoricacid as the catalyst, delivering a large panel of axiallychiral heterobiaryl diamines in generally good yields with excellent enantioselectivities. The gram-scale reaction and postmodification of the chiral product demonstrated
An efficient one-pot synthesis of N-(1,3-diphenyl-1H-pyrazol- 5-yl)amides
作者:Wei-Nien Su、Tsung-Ping Lin、Kaung-Min Cheng、Kuan-Chin Sung、Shao-Kai Lin、Fung Fuh Wong
DOI:10.1002/jhet.343
日期:——
Abstractmagnified image A “one‐pot” method for the synthesis of N‐(1,3‐diphenyl‐1H‐pyrazol‐5‐yl)amides was developed by cyclization of benzoylacetonitrile (1) and phenylhydrazine in neat condition followed by acylation. The corresponding N‐(1,3‐diphenyl‐1H‐pyrazol‐5‐yl)amides were provided in good to excellent yields (70–90%). The significant advantages of the new synthetic method are excellent yields and simple work‐up procedure without isolation and purification of intermediary 5‐amino‐1,3‐diphenyl pyrazol (2). J. Heterocyclic Chem., (2010).
Simay, A.; Takacs, K.; Toth, L., Acta Chimica Academiae Scientiarum Hungaricae, 1982, vol. 109, # 2, p. 175 - 188
作者:Simay, A.、Takacs, K.、Toth, L.
DOI:——
日期:——
Justoni; Fusco, Gazzetta Chimica Italiana, 1938, vol. 68, p. 59,72