Tetrahedron Letters p. 5533 - 5536 (1997)
Update date:2022-09-26
Topics:
Murakami, Nobutoshi
Wang, Weiqi
Aoki, Masashi
Tsutsui, Yasuhiro
Higuchi, Kouichi
Aoki, Shunji
Kobayashi, Motomasa
The unidentified configurations at C5 and C10 incallystatin A (1), a potent cytotoxic polyketide from the marine sponge Callyspongia truncata, were determined to be R,R by comparing the circular dichroism spectrum of 1 with those of two model compounds 2 and 3. Compounds 2 and 3 were synthesized by using E-selective Wittig olefination at the C6-C7 position as a key reaction.
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