摘要:
Commercially feasible methods for synthesizing various epothilones precursors needed for the preparation of final epothilones are provided, including techniques for the synthesis of epothilone segment A and C precursors. Segment C precursors are prepared using starting nitriles, which can alternately be oxidized to ketones and converted, or reacted to form the diol with subsequent conversion to the segment. Segment A precursors are prepared by reacting a starting enone with a chiral catalyst to give an intermediate alcohol in high enantomeric excess, followed by conversion of the alcohol to the desired Segment A precursor.
摘要:
Commercially feasible methods for synthesizing various epothilones precursors needed for the preparation of final epothilones are provided, including techniques for the synthesis of epothilone segment C using a stereoselective Noyori-type reduction, and the coupling of epothilone segments B and C using an aldol condensation reaction. The synthesis methods may be used to prepare naturally occurring segments as well as a large number of related analogs and homologs thereof. Final epothilones in accordance with the invention may also be of the naturally occurring variety (16-membered macrolides), while the homologs and analogs thereof are preferably up to 20-membered macrolides.
摘要:
The present invention provides novel methods for the synthesis of (S)-6-chloro-4-cyclopropylethynyl-4-trifluoromethyl-1,4-dihydro-2H-3,1-benzoxazin-2-one of formula (III) which is useful as a human immunodeficiency virus (HIV) reverse transcriptase inhibitor.