1,4-Chirality transfer via the ester enolate Claisen rearrangements in the preparation of (25R)- and (25S)-cholestenoic acids
Keywords: DMAP, 4-dimethylaminopyridine; HMPA, hexamethylphosphoramide; LXR, liver X receptor; TBSCl, tert-butyldimethylsilyl chlorideCholestenoic acids; Dafachronic acids; Ireland-Claisen rearrangement; Orthoester Claisen rearrangement; Allenes