Microbiological reduction of keto-sulfones. Application in a three-step synthesis of (S)-(+)-β-angelica lactone
摘要:
Microbiological reductions of several keto-sulfones led to the corresponding hydroxy-sulfones in moderate to high enantiomeric excess. A three-step synthesis of (S)-(+)-beta-angelica lactone from ethyl-4-oxo-3-(phenyl-sulfonyl)-pentanoate via the intermediate chiral alcohol is described.
Microbiological reduction of keto-sulfones. Application in a three-step synthesis of (S)-(+)-β-angelica lactone
摘要:
Microbiological reductions of several keto-sulfones led to the corresponding hydroxy-sulfones in moderate to high enantiomeric excess. A three-step synthesis of (S)-(+)-beta-angelica lactone from ethyl-4-oxo-3-(phenyl-sulfonyl)-pentanoate via the intermediate chiral alcohol is described.
Reaction of β-keto phenylsulphone tosylhydrazones 2 with 2 eq. of DBU, at r.t. in dichloromethane, affords α,β-unsaturated ketone tosylhydrazones 4, via the tosylazoalkenes 3 obtained by 1,4-elimination of benzenesulfinic acid.