Journal
ORGANIC LETTERS
Volume 7, Issue 14, Pages 2949-2952Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol050915o
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Azetidinecarboxylate esters react readily with metallocarbenes in an inter- or intramolecular fashion to generate azetidinium ylides. Efficient [1,2]-shift by the ester-substituted carbon furnishes ring-expanded pyrrolidine products. In the case of substrate 1, this provides access to the pyrrolizidine alkaloids turneforcidine and platynecine via a high-yield, five-step sequence starting with readily available methyl 1-benzylazetidine-2-carboxylate.
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