(4S,5R,7S)-5-iodocrassalactone D 在
偶氮二异丁腈 、 三正丁基氢锡 作用下,
以
甲苯 为溶剂,
反应 1.0h,
以71%的产率得到(4R,7S)-(+)-crassalactone D
参考文献:
名称:
Synthesis and antiproliferative activity of goniobutenolides A and B, 5-halogenated crassalactone D derivatives and the corresponding 7-epimers
摘要:
A new synthesis of goniobutenolides A (1) and B (2) and the corresponding 7-epimers has been achieved starting from diacetone D-glucose. The key step of the synthesis is a new one-pot sequence that commenced with Z-selective Wittig (or Horner-Wadsworth-Emmons) olefination, followed by successive gamma-lactonisation and beta-elimination. The above-mentioned unsaturated lactones were then converted to the corresponding 5-halogenated crassalactone D derivatives by using the appropriate haloetherification protocol. The most of synthesized compounds exhibited potent cytotoxic activities against a panel of tumour cell lines. The main structural features responsible for their antitumour potency have been revealed by means of SAR analysis. Flow cytometry data suggested that cytotoxic effects of these compounds in the culture of K562 cells might be mediated by apoptosis, additionally revealing that these molecules induced changes in cell cycle distribution of these cells. Results of semi-quantitative Western blot analysis indicate that the most of synthesized compounds induce apoptosis in a caspase-dependent manner. (C) 2015 Elsevier Masson SAS. All rights reserved.
Naturally occurring styryl lactone, crassalactone D (1), unnatural 4-epi-crassalactone D (2), and the corresponding 7-epimers (3 and 4) have been synthesized starting from d-glucose. The key step of the synthesis is a new one-pot sequence that commenced with a Z-selective Wittig olefination of suitably functionalized sugar lactols with a stabilized ylide, (methoxycarbonylmethylene)-triphenylphosphorane
Goniobutenolides A (1) and B (2), crassalactone D (3), 4-epi-crassalactone D (4), and the corresponding 7-epimers have been synthesized starting from d-glucose. The key step in the synthesis of 1 and 2 is a new one-pot sequence comprised of a Z-selective Wittig olefination/lactonization/β-elimination. Preparation of 3 and 4 included the final 5-endo-trig spirocyclization of 1 and 2. The synthesized
A new synthesis of goniobutenolides A (1) and B (2) and the corresponding 7-epimers has been achieved starting from diacetone D-glucose. The key step of the synthesis is a new one-pot sequence that commenced with Z-selective Wittig (or Horner-Wadsworth-Emmons) olefination, followed by successive gamma-lactonisation and beta-elimination. The above-mentioned unsaturated lactones were then converted to the corresponding 5-halogenated crassalactone D derivatives by using the appropriate haloetherification protocol. The most of synthesized compounds exhibited potent cytotoxic activities against a panel of tumour cell lines. The main structural features responsible for their antitumour potency have been revealed by means of SAR analysis. Flow cytometry data suggested that cytotoxic effects of these compounds in the culture of K562 cells might be mediated by apoptosis, additionally revealing that these molecules induced changes in cell cycle distribution of these cells. Results of semi-quantitative Western blot analysis indicate that the most of synthesized compounds induce apoptosis in a caspase-dependent manner. (C) 2015 Elsevier Masson SAS. All rights reserved.