6533b828fe1ef96bd12885d1

RESEARCH PRODUCT

A Modular Formal Total Synthesis of (±)-Cycloclavine

Till OpatzNatalie Netz

subject

CycloclavineAlkylationMolecular Structure010405 organic chemistryOrganic ChemistryTotal synthesisStereoisomerismStereoisomerismAlkylationBridged Bicyclo Compounds Heterocyclic010402 general chemistry01 natural sciencesCoupling reactionIndole Alkaloids0104 chemical sciencesHexanechemistry.chemical_compoundchemistryCyclizationHeck reactionYield (chemistry)HexanesOrganic chemistry

description

Cycloclavine is a clavine-type Ergot alkaloid noteworthy for its unique pentacyclic skeleton featuring a 3-azabicyclo[3.1.0]hexane substructure. A short convergent route to the racemic alkaloid is described which comprises only eight linear steps and requires only four chromatographic purifications. The two key building blocks can be prepared in high yield from commercially available starting materials. Two consecutive coupling reactions, namely a selective alkylation of a dienolate and a Heck reaction, are the key steps of the reaction sequence.

https://doi.org/10.1021/acs.joc.5b02815