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2005
Other bioactive products
U 1300
Synthesis of the ABCD And ABCDE Ring Systems of Azaspiracid-1. — An effisynthesis of the ABCDE ring system of azaspiracid-1 is reported. It is important
10- 236 cient
to note that all asymmetric centers of target compound (XIV) exhibits the correct stereochemistry of the natural product. Key transformations include the bisspiroketalization of ketone (III) to provide a single transoidal bisspiroketal (IV). Furthermore, a
Wadsworth-Emmons coupling is used to establish the C19/20 linkage, cf. formation of
(XII). — (ZHOU, X.-T.; CARTER*, R. G.; Chem. Commun. (Cambridge) 2004, 19,
2138-2140; Dep. Chem., Oreg. State Univ., Corvallis, OR 97331, USA; Eng.) —
M. Paetzel
2005
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