Iridoids. Asymmetric Synthesis Via Enantiomeric Separation of the Mono Methylester of 2, 3‐DI‐Endo‐Hydroxycarbonyl‐5‐Norbornene

Abstract
Enantiomeric separation of racemic mono methylester of the known 2, 3‐di‐endo‐hydroxycarbonyl‐5‐norbornene (2) is possible via the ephedrine salts. Both enantiomers can be converted into 2, R‐endo‐methoxycarbonyl‐3, S‐endo‐hydroxymethyl‐5‐norbornene (−)−4, which is a suitable intermediate for asymmetric synthesis of iridoids.