Diastereoface Discrimination in the Addition of Acetylide to a Chiral Aldehyde, Leading to a Synthesis of (+)-Deoxybiotin in Enantiomerically Pure Form Starting from L-Cysteine
Complete diastereofacial discrimination was observed upon addition of the chlorozinc acetylide derived from 1-hexyne to a chiral aldehyde prepared from L-cysteine. The addition product was used in a short synthesis of (+)-deoxybiotin, a precursor of (+)-biotin, which was produced in enantiomerically pure form in 12 steps, starting from L-cysteine.
Contribution to the development of new substitution patterns of optically active .beta.-lactams: synthesis of homochiral 4-(1-aminoalkyl)azetidin-2-ones from N-(tert-butyloxycarbonyl) .alpha.-amino aldehyde-derived imines via asymmetric Staudinger reaction
作者:Claudio Palomo、Fernando P. Cossio、Carmen Cuevas、Begona Lecea、Antonia Mielgo、Pascual Roman、Antonio Luque、Martin Martinez-Ripoll
DOI:10.1021/ja00050a016
日期:1992.11
their corresponding acid chlorides and triethylamine, to produce homochiral cis-3-alkoxy-4-(1-aminoalkyl) β-lactams with virtually complete control of diastereoselectivity. In a similar manner, the reaction of phthalimidoacetyl chloride with these imines in the presence of triethylamine afforded the corresponding 3-phthalimido β-lactams as single diastereomers