Highly selective chirally templated isomünchnone cycloadditions of achiral aldehydes: Synthesis of an enantiopure α,β-dihydroxyacid
摘要:
Additions of p-nitro- and p-methoxybenzaldehyde to isomunchnone derivatives of (5S)-phenyloxazin-3-one and -2,3-dione led to corresponding adducts (3,4,6) with excellent diastereofacial and exo-selectivity, Hydrolysis and subsequent cleavage of adduct 3 permitted recovery of the original template and furnished dihydroxyacid 9 that was transformed into the known ethyl ester 10. Comparison of its optical rotation with the literature value confirmed its high optical purity. (C) 1997 Elsevier Science Ltd.
Highly selective chirally templated isomünchnone cycloadditions of achiral aldehydes: Synthesis of an enantiopure α,β-dihydroxyacid
摘要:
Additions of p-nitro- and p-methoxybenzaldehyde to isomunchnone derivatives of (5S)-phenyloxazin-3-one and -2,3-dione led to corresponding adducts (3,4,6) with excellent diastereofacial and exo-selectivity, Hydrolysis and subsequent cleavage of adduct 3 permitted recovery of the original template and furnished dihydroxyacid 9 that was transformed into the known ethyl ester 10. Comparison of its optical rotation with the literature value confirmed its high optical purity. (C) 1997 Elsevier Science Ltd.
Highly selective chirally templated isomünchnone cycloadditions of achiral aldehydes: Synthesis of an enantiopure α,β-dihydroxyacid
作者:Michael G.B Drew、Marion Fengler-Veith、Laurence M Harwood、Archie W Jahans
DOI:10.1016/s0040-4039(97)00919-2
日期:1997.6
Additions of p-nitro- and p-methoxybenzaldehyde to isomunchnone derivatives of (5S)-phenyloxazin-3-one and -2,3-dione led to corresponding adducts (3,4,6) with excellent diastereofacial and exo-selectivity, Hydrolysis and subsequent cleavage of adduct 3 permitted recovery of the original template and furnished dihydroxyacid 9 that was transformed into the known ethyl ester 10. Comparison of its optical rotation with the literature value confirmed its high optical purity. (C) 1997 Elsevier Science Ltd.