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- W2097910573 abstract "The synthesis of diester 3, a synthon for the C(19)-to-C(27) segment of rifamycin S (1), is described, starting from the meso-diester 4 (Schemes 2 and 3). Inversion of the configuration at the later C(23) and two aldol condensations with the lithium enolate 18 of 2,6-dimethylphenyl propionate each producing two new chiral centres of threo-configuration, led to the desired diester 3. The absolute configuration of the new chiral centres was proven by a single X-ray analysis of intermediate 19 (Fig.) and by converting diester 3 into meso-diester 25." @default.
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- W2097910573 date "1990-12-12" @default.
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- W2097910573 title "Stereoselective Synthesis of the C(19)-to-C(27) Segment of Rifamycin S" @default.
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- W2097910573 doi "https://doi.org/10.1002/hlca.19900730821" @default.
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