This invention provides a method of preparing amine stereoisomers, which comprises stereoselectively reducing a sulfinylimine that bears on the sulfinyl group a residue of an alcohol, thiol or amine, or reacting a sulfinylimine stereoisomer that bears on the sulfinyl group a residue of an alcohol, thiol or amine with a source of a nucleophile, to afford a sulfinylamine stereoisomer, followed by contacting the sulfinylamine stereoisomer with a reagent suitable for the cleavage of a sulfur-nitrogen bond, to afford an amine stereoisomer. It also provides novel intermediates useful in the method, and the use of certain of the intermediates in the preparation of sulfoxide and sulfinylamine stereoisomers.
This invention provides intermediates useful in a method of preparing amine stereoisomers. It also provides a method of preparing sulfoxide and sulfinylamine stereoisomers using certain of the intermediates.
A unified strategy for the synthesis of Kopsia monoterpenoid indole alkaloids is described. Key transformations developed are an intramolecular Pummerer rearrangement induced nucleophilic cyclization/aza-Prins cyclization to construct the highly functional hexahydrocarbazole skeleton, an iridium complex mediated radical addition to fuse the aspidofractine framework, and an IBX oxidation to introduce