New Bis(chalcones) and Their Transformation into Bis(pyrazoline) and Bis(pyrazole) Derivatives
作者:Diana C. G. A. Pinto、Artur M. S. Silva、José A. S. Cavaleiro、José Elguero
DOI:10.1002/ejoc.200390117
日期:2003.2
The reaction of bis(chalcones) 1a−d and bis(chalcone) tetrabromo derivatives 3a−d with hydrazine hydrate gave bis(pyrazolines) 4a−d and bis(pyrazoles) 5a−d, respectively. Bis(pyrazoles) 5e,f bearing hydroxyphenyl substituents have been prepared from the reaction of bis(chromones) 6c,d with hydrazine hydrate, because their synthesis from the corresponding benzyloxy-substituted 5c,d gave very poor yields
of alternating benzene and furan rings, para- and meta-bis(5-phenylfur-3-yl)benzenes, were expeditiously synthesized by double Mn(OAc)3-catalyzed oxidative decarbonylation and Paal–Knorr reactions of β-ketoesters, prepared from the conjugate addition of ethyl acetoacetate to para- and meta-bis(chalcones). Stronger fluorescence intensity was observed for meta-bis(phenylfuryl)benzene with ortho-methoxy
Chemoselective Hydrogenation of α,β-Unsaturated Ketones Catalyzed by a Manganese(I) Hydride Complex
作者:Kartick Dey、Graham de Ruiter
DOI:10.1021/acs.orglett.4c00277
日期:2024.5.24
Here, we report the chemoselectivehydrogenation of α,β-unsaturatedketones catalyzed by a well-defined Mn(I) PCNHCP pincer complex [(PCNHCP)Mn(CO)2H] (1). The reaction is compatible with a wide variety of functional groups that include halides, esters, amides, nitriles, nitro, alkynes, and alkenes, and for most substrates occurs readily at ambient hydrogen pressure (1–2 bar). Mechanistic studies and
在这里,我们报道了由明确的 Mn(I) PC NHC P 钳配合物 [(PC NHC P)Mn(CO) 2 H] 催化的 α,β-不饱和酮的化学选择性氢化 ( 1 )。该反应与多种官能团兼容,包括卤化物、酯、酰胺、腈、硝基、炔烃和烯烃,并且对于大多数底物来说,在环境氢气压力(1-2 bar)下很容易发生。机理研究和氘标记实验揭示了一种非合作机制,本报告将对此进行进一步讨论。
Reddy, D Bhaskar; Seenaiah, B; Padmavathi, V, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1992, vol. 31, # 8, p. 503 - 506
作者:Reddy, D Bhaskar、Seenaiah, B、Padmavathi, V
DOI:——
日期:——
Bhaskar Reddy; Seenaiah; Muralidhar Reddy, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1996, vol. 35, # 10, p. 1012 - 1016