Borohydride reduction of acetophenone and esters of dehydrocarboxylic acids in the presence of chiral cobalt(II) diamine complexes
作者:L. O. Nindakova、B. A. Shainyan
DOI:10.1007/s11172-005-0258-8
日期:2005.2
The catalytic reduction of acetophenone, methyl α-acetamidocinnamate, and dimethyl itaconate with alcohol-modified sodium borohydride was studied in the presence of complexes CoCl2·L2 (L2 are chiral C 2-symmetric diamines: (4S,5S)-2,2-dimethyl-4,5-bis(aminomethyl)-1,3-dioxolane, (4S, 5S)-2,2-dimethyl-4,5-bis(methylaminomethyl)-1,3-dioxolane, (4S, 5S)-2,2-dimethyl-4,5-bis(dimethylaminomethyl)-1,3-dioxolane, and (4S, 5S)-2,2-dimethyl-4,5-bis(diphenylaminomethyl)-1,3-dioxolane). The maximum enantiomeric excess of (S)-1-phenylethanol was 24%, that of dimethyl α-methylsuccinate was 38%.
研究了在络合物 CoCl2-L2 (L2 为手性 C 2 对称二胺)存在下,用醇改性硼氢化钠催化还原苯乙酮、α-乙酰胺肉桂酸甲酯和衣康酸二甲酯的过程:(4S,5S)-2,2-dimethyl-4,5-bis(aminomethyl)-1,3-dioxolane, (4S, 5S)-2,2-dimethyl-4,5-bis(methylaminomethyl)-1,3-dioxolane, (4S、(4S,5S)-2,2-二甲基-4,5-双(二甲基氨基甲基)-1,3-二氧戊环,(4S,5S)-2,2-二甲基-4,5-双(二苯基氨基甲基)-1,3-二氧戊环)。(S)-1-苯基乙醇的最大对映体过量率为 24%,α-甲基琥珀酸二甲酯的最大对映体过量率为 38%。