Functionalised pyrrolidinones derived from (S)-pyroglutamic acid
作者:Mark J Beard、Jonathan H Bailey、David T Cherry、Mark G Moloney、Sung Bo Shim、Kathryn A Statham、Mark J Bamford、R Brian Lamont
DOI:10.1016/0040-4020(96)00047-6
日期:1996.3
derived from bicyclic lactams 2a-c, prepared from (S)-pyroglutamicacid 1a, and subsequent reaction with a range of electrophiles, is reported. Exo-diastereoselectivity is generally favoured. The deprotection of some of these adducts to give functionalised hydroxymethylpyrrolidinones is readily achieved by simple hemiaminal ether cleavage under acidic conditions.
Efficient synthesis of (S)-(+)-lycoperdic acid has been achieved by use of the stereoselective hydroxylation of the enolate derived from the bicyclic lactam 3 with the molybdenum oxidizing reagent, MoOPH (MoO5·Py·HMPA, oxodiperoxymolybdenum(pyridine)(hexamethylphosphoric triamide)), as a key step.