Popis: |
We describe the photoinduced addition of methanol to 5( S )-5-triisopropylsiloxymethyl-N-boc-dihydropyrrole-2(5 H )-one to produce 5( S )-5-triisopropylsiloxymethyl-4( S )-hydroxymethyl-pyrrolidine-2-one, and conversion of this into a variety of 4(S), 5( S )-pyrrolidine-2-ones. Photo-induced addition of methanol to 5( R )-N-boc-5-amino-dihydropyran-2(5 H )-one yielded the unexpected product 4( S )-1′-[2′-hydroxy, 1′-( R )-N-boc-amino]ethyl-tetrahydrofuran-2-one via rearrangement of the initial photoadduct. |