SmI<sub>2</sub>-Mediated Intermolecular Coupling of γ-Lactam <i>N</i>-α-Radicals with Activated Alkenes: Asymmetric Synthesis of 11-Hydroxylated Analogues of the Lead Compounds CP-734432 and PF-04475270
represents the first intermolecular coupling reaction of the γ-lactam N-α-alkyl radicals of types B, B1, and B2 with activated alkenes. Two radical-based mechanisms were suggested. The asymmetricsynthesis of the 11-hydroxylated analogue of the highlyselective EP4 receptor agonist PF-04475270 (30), the 11-hydroxylated analogue of ocular hypotensive CP-734432 (31), compounds 35 and 36 have been achieved on
Stereoselective synthesis of (S)-oxiracetam and (S)-GABOB from (R)-glyceraldehyde acetonide
作者:Ishita Sanyal、Brajesh Shukla、Piyali Deb Barman、Asish Kumar Banerjee
DOI:10.1016/j.tetlet.2013.03.035
日期:2013.5
Synthetic routes to (S)-oxiracetam and (S)-GABOB have been developed starting from (R)-glyceraldehydeacetonide through its conversion to an appropriate aldehyde intermediate followed by reductive amination using glycinamide hydrochloride/benzyl amine and subsequent chemical transformations.