Enantiodivergent synthesis of either enantiomer of ABCDE-ring analogue of antitumor antibiotic fredericamycin A via intramolecular [4 + 2] cycloaddition approach.
Enantiodivergent synthesis of either enantiomer of ABCDE-ring analogue of antitumor antibiotic fredericamycin A via intramolecular [4 + 2] cycloaddition approach.
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DOI:
10.1021/ol016696y
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发表时间:
2001-11
期刊:
影响因子:
5.2
通讯作者:
S. Akai;Toshiaki Tsujino;Nobuhisa Fukuda;Kiyosei Iio;Y. Takeda;Ken-ichi Kawaguchi;T. Naka;Kazuhiro Higuchi;Yasuyuki Kita
中科院分区:
文献类型:
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作者:
S. Akai;Toshiaki Tsujino;Nobuhisa Fukuda;Kiyosei Iio;Y. Takeda;Ken-ichi Kawaguchi;T. Naka;Kazuhiro Higuchi;Yasuyuki Kita
[reaction: see text] An intramolecular enantiodivergent synthesis of both enantiomers of the ABCDE-ring analogue 22 of fredericamycin A is reported. Key steps involve an intramolecular [4 + 2] cycloaddition of 17 and an aromatic Pummerer-type reaction of 19. A lipase-catalyzed enantioselective desymmetrization of prochiral diol 2 using 1-ethoxyvinyl 2-furoate 3 led to the pivotal intermediate (R)-4.