6533b86dfe1ef96bd12ca233

RESEARCH PRODUCT

Synthetic Studies towards Pectenotoxin-2: Synthesis of the Nonanomeric 10-epi-ABCDE Ring Segment by Kinetic Spiroketalization

Petri M. PihkoA. PiisolaK. Syam KrishnanJatta E. Aho

subject

chemistry.chemical_classificationAddition reactionStereochemistryOrganic ChemistryRing (chemistry)MetathesisAldehydeChemical synthesischemistryNucleophilePhysical and Theoretical ChemistryChirality (chemistry)ta116Lactone

description

The synthesis of the nonanomeric 10-epi-ABCDE ring system of pectenotoxin-2 has been achieved by using a kinetic spiroketalization reaction. The synthesis of the spiroketalization precursor was achieved through a cross-metathesis/hydro-genation sequence. The formation of the epi-C10 isomer resulted from an unexpected anti-Felkin selective addition of organometallic nucleophiles to the advanced CDE ring precursor. This addition reaction was investigated with differently protected α,β-dioxygenated model aldehydes, which displayed similar anti-Felkin selectivities with organometallic nucleophiles.

10.1002/ejoc.201001411http://juuli.fi/Record/0050984911