The total synthesis of raistrickindole
A has been achieved, thereby
confirming the proposed structure as an N-hydroxylated
DKP. In the first but less selective approach, the DKP was built up
by cyclization of a diastereoisomerically mixed N-hydroxylated dipeptide. In the second approach, the same DKP was
constructed stereoselectively by the intramolecular Mitsunobu reaction
of a hydroxamic acid. The synthesis was completed by a stereoselective
oxidative cyclization.
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