Formal Total Synthesis of Clausenamide
SYNLETT(1992)
Abstract
Ruthenium tetroxide oxidation of trans-5-substituted 4-acylaminocyclohexenes 2 followed by esterification gave N-protected cis-4-substituted 5-(methoxycarbonylmethyl)-2-pyrrolidones 4. The resulting pyrrolidone 4a (N-Boc-4-phenyl) was converted into the key intermediate 8 (cis-5-formyl-1-methyl-4-phenyl-2-pyrrolidinone), thus achieving the formal total synthesis of clausenamide [3-hydroxy-5-(alpha-hydroxybenzyl)-1-methyl-4-phenyl-2-pyrrolidinone].
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Key words
total synthesis
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