Stereoselective synthesis of homochiral pyrrolidinones and cis, cis-bis-β-lactams from (+)-(1S,2S)-2-amino-1-phenylpropan-1,3-diol
作者:Muthusamy Jayaraman、Vedavati G Puranik、Baburao M Bhawal
DOI:10.1016/0040-4020(96)00462-0
日期:1996.7
The homochiral β-lactams described in the preceding paper undergone an acid catalyzed rearrangement to 4-aminopyrrolidinones 2a-e in excellent yields. A diastereoselective synthesis of cis,cis-bis-β-lactams 13 & 14 has been achieved by using imines bearing a β-lactam back bone in good yields and good to excellent selectivities.
Imines 1 & 2 derived from (+)-(1S,2S)-2-amino-1-phenylpropan-1,3-diol on cycloaddition reaction using acid chlorides (or equivalent) 3-6 in the presence of triethylamine furnished stereoselectively cis-beta-lactams 7a-f in good yields. The aminols 8b,c on treatment with lead tetraacetate under different reaction conditions gave 4-cyano (9b,c) and 4-formyl (10b,c) beta-lactams in high yields.