Crotylation versus propargylation: two routes for the synthesis of the C13-C18 fragment of the antibiotic branimycin.
2007
The C13−C18 fragment 3 of the novel antibiotic branimycin was prepared along two highly stereocontrolled routes. The first one uses a standard Roush crotylation protocol, whereas the second one proceeds via an allenyl silane propargylation with unexpected stereochemical consequences, which are discussed in detail.
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