Anti-melanogenesis screening of 47 synthesized curcumin-like diarylpentanoid analogues was performed to show that some had a potent inhibitory effect on the melanogenesis in B16 melanoma cells. Their actions were considered to be mostly due to tyrosinase inhibition, tyrosinase expression inhibition, and melanin pigment degradation. The structure–activity relationships of those curcumin-like diarylpentanoid analogues which inhibited the melanogenesis and tyrosinase activity were also discussed. Of those compounds assayed, (2E,6E)-2,6-bis(2,5-dimethoxybenzylidene)cyclohexanone showed the most potent anti-melanogenesis effect, the mechanism of which is considered to be the degradation of the melanin pigment in B16 melanoma cells, affecting neither the tyrosinase activity nor tyrosinase expression.
Solvent-Free Crossed Aldol Condensation of Cyclic Ketones with Aromatic Aldehydes Assisted by Microwave Irradiation
作者:Abbas A. Esmaeili、Mehri Salimi Tabas、Mohammad A. Nasseri、Foad Kazemi
DOI:10.1007/s00706-004-0256-9
日期:2005.4
A fast alumina-promoted crossed aldol-condensation reaction of aldehydes and cyclic ketones under microwave irradiation is described. This process is simple, efficient, and environmentally benign and proceeds in fairly high yield without any self-condensation.
Aldol Condensation of Cycloalkanones with Aromatic Aldehydes Catalysed with TiCl3(SO3CF3)
作者:N. Iranpoor、B. Zeynizadeh、A. Aghapour
DOI:10.1039/a809827a
日期:——
Efficient cross-aldol condensation of cyclopentanone, cyclohexanone and 1-indanone with various aromaticaldehydes is catalysed with TiCl3(SO3CF3) at room temperature in excellent yields.
Water promoted C–C bond cleavage: facile synthesis of 3,3-bipyrrole derivatives from dienones and tosylmethyl isocyanide (TosMIC)
作者:Rong Wang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1039/c3ob42570c
日期:——
A simple and highly efficient synthetic strategy to access 3,3-bipyrrole derivatives by the reaction of dienone derivatives with TosMIC is reported. The reaction involves a van Leusen's pyrrole synthesis followed by an unusual CâC bond cleavage in the presence of water under mild conditions.
本报告介绍了一种通过二烯酮衍生物与 TosMIC 反应获得 3,3-联吡咯衍生物的简单而高效的合成策略。该反应涉及 van Leusen 的吡咯合成,然后在温和的条件下,在有水存在的情况下进行不寻常的 CâC 键裂解。
Ananthakrishna Nadar; Renuga, Journal of the Indian Chemical Society, 2006, vol. 83, # 12, p. 1219 - 1222