1987
DOI: 10.1002/chin.198714340
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S. TAKASE,
Y. ITOH,
I. UCHIDA
et al.

Abstract: Abstract 340ChemInform Abstract The synthesis of the title compound (X) starts from the acid (I). The intermediate (Va) is transformed to the derivatives (Vb) or (Vc) by hydrolysis with NaOH or by reaction with HBr/AcOH. Coupling of (Vb) and (Vc) yields the dipeptide (VIa). Cleavage of the Z-group and treatment with MeOH/NH3 affords the diketopiperazine (VII). Two inverted prenyl groups are introduced to (VII) by a thio-Claisen rearrangement and the resulting compound (IXa) is transformed to (X) by reductive …

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