67680-46-0Relevant academic research and scientific papers
Second-generation total synthesis of aplyronine A featuring Ni/Cr-mediated coupling reactions
Hayakawa, Ichiro,Saito, Keita,Matsumoto, Sachiko,Kobayashi, Shinichi,Taniguchi, Ayaka,Kobayashi, Kenichi,Fujii, Yusuke,Kaneko, Takahiro,Kigoshi, Hideo
supporting information, p. 124 - 131 (2016/12/27)
Second-generation total synthesis of aplyronine A, a potent antitumor marine macrolide, was achieved using Ni/Cr-mediated coupling reactions as key steps. The overall yield of the second-generation synthetic pathway of aplyronine A was 1.4%, obtained in 38 steps based on the longest linear sequence. Compared to our first-generation synthetic pathway of aplyronine A, the second-generation synthesis greatly improved both the yield and number of steps. In particular, we improved the stereoselectivity in the construction of the C13 stereogenic center and the C14-C15 (E)-trisubstituted double bond using the asymmetric Ni/Cr-mediated coupling reaction. Furthermore, we established efficient reaction conditions for the asymmetric Ni/Cr-mediated coupling reaction between the C21-C28 segment and C29-C34 segment. Thus, this coupling reaction proceeded with an equimolar ratio of each segment.
Dinuclear asymmetric Zn aldol additions: Formal asymmetric synthesis of fostriecin
Trost, Barry M.,Frederiksen, Mathias U.,Papillon, Julien P. N.,Harrington, Paul E.,Shin, Seunghoon,Shireman, Brock T.
, p. 3666 - 3667 (2007/10/03)
Direct asymmetric aldol reactions constitute a powerful methodology for the efficient synthesis of complex natural products. Herein we report the first application of our recently reported dinuclear Zn-catalyzed direct aldol addition of alkynyl ketones to
Aplyronine A, a potent antitumor substance of marine origin, aplyronines B and C, and artificial analogues: Total synthesis and structure-cytotoxicity relationships
Kigoshi, Hideo,Suenaga, Kiyotake,Mutou, Tsuyoshi,Ishigaki, Takeshi,Atsumi, Toshiyuki,Ishiwata, Hiroyuki,Sakakura, Akira,Ogawa, Takeshi,Ojika, Makoto,Yamada, Kiyoyuki
, p. 5326 - 5351 (2007/10/03)
The enantioselective total synthesis of aplyronine A (1), a potent antitumor substance of marine origin, was achieved by a convergent approach. Three segments 4, 5, and 6, corresponding to the C5-C11, C21-C27, and C28-C34 portions of aplyronine A (1), were prepared using the Evans aldol reaction and the Sharpless epoxidation as key steps. The coupling reaction of 4 with iodide 7 followed by Julia olefination with sulfone 8 gave the C5-C20 segment 9, while the Julia coupling reaction between segments 5 and 6 provided the C21-C34 segment 10. Julia olefination between segments 9 and 10 and the subsequent four-carbon homologation reaction led to seco acid 83, which was converted into aplyronine A (1) by Yamaguchi lactonization followed by the introduction of two amino acids. The use of the [(3,4-dimethoxybenzyl)oxy]methyl group as a protecting group for the hydroxyl at C29 was crucial for this synthesis. The enantioselective synthesis of two natural congeners, aplyronines B (2) and C (3), was also carried out using the intermediates for the synthesis of 1, which determined the absolute stereostructures of 2 and 3 unambiguously. To study the structure-cytotoxicity relationships of aplyronines, artificial analogues of 1 were synthesized and their cytotoxicities were evaluated: the trimethylserine moiety, two hydroxyl groups, and the side chain portion in 1 turned out to be important in the potent cytotoxicity shown by 1. Biological studies with aplyronine A (1) showed that 1 inhibited polymerization of G-actin to F-actin and depolymerized F-actin to G-actin.
