Some 1, 5-dihydro-5-deazaflavin (1, 5-dihydropyrimido [4, 5-b] quinoline-2, 4 (3H, 10H) -dione) derivatives possessing chiral substituents at the N-3 position were synthesized. Asymmetric reduction of ethyl benzoylformate in the presence of magnesium perchlorate was carried out with these chiral 1, 5-dihydro-5-deazaflavin derivatives to give ethyl mandelate in moderate optical and chemical yield. The influence of metal additives other than magnesium upon the asymmetric induction and yield of the reduction was investigated, and it was suggested that intermediate ternary complexation is probably involved in the reaction. No improvement of chiral induction was obtained by changing the metal catalyst.
研究人员合成了一些 1, 5-二氢-
5-脱氮黄素(1, 5-二氢
嘧啶并[4, 5-b]
喹啉-2, 4 (3H, 10H) -二酮)衍
生物,这些衍
生物在 N-3 位具有手性取代基。在
高氯酸镁存在下,用这些手性 1, 5-二氢-
5-脱氮黄素衍
生物对
苯甲酰甲酸乙酯进行了不对称还原,得到了
扁桃酸乙酯,光学和
化学收率适中。研究了
镁以外的
金属添加剂对不对称诱导和还原产率的影响,结果表明中间三元络合可能参与了反应。改变
金属催化剂并不能改善手性诱导。