Synthesis and stereochemical determination of batzelladine C methyl ester
作者:Michael Butters、Christopher D. Davies、Mark C. Elliott、Joseph Hill-Cousins、Benson M. Kariuki、Li-ling Ooi、John L. Wood、Stuart V. Wordingham
DOI:10.1039/b914744f
日期:——
Batzelladine C (3) is a tricyclic guanidine alkaloid of unknown stereochemistry at one centre as well as unknown absolute stereochemistry. The two possible diastereoisomers of the methylester corresponding to this compound have been synthesised, permitting the relative and absolute stereochemistry of this compound to be assigned.
The totalsynthesis of (−)-δ-lycorane is reported. We performed organocatalytic Mannich reaction between phenylacetaldehyde and γ-hydroxy lactam to construct a 5-substituted-2-pyrrolidone derivative in favor of the cis-isomer. Furthermore, diastereoselective conjugate addition to α,β-unsaturated lactam was accomplished to obtain 4,5-disubstituted-2-pyrrolidone. The other salient features of this synthesis