Nonracemic aryl-substituted α-methyldihydrocinnamaldehyde derivatives employed as olfactory principles in perfumes (Lilialâ¢, Helionalâ¢) were obtained via enzymatic reduction of the corresponding cinnamaldehyde precursors using cloned and overexpressed ene-reductases. (R)-Enantiomers were obtained using the old-yellow-enzyme (OYE) homolog YqjM from Bacillus subtilis and 12-oxophytodienoic acid reductase isoenzyme OPR1 from tomato (e.e.max 53%), and (S)-aldehydes were furnished in up to 97% e.e. using isoenzyme OPR3, nicotinamide 2-cyclohexene-1-one reductase NCR from Zymomonas mobilis and yeast OYE isoenzymes 1â3 under optimised reaction conditions in the presence of t-butyl methyl ether as the co-solvent. The stereochemical outcome of the reduction of α-methylcinnamaldehyde using NCR and OYEs 1â3 [previously reported to be (R)] was unambiguously corrected to be (S).
在香
水中用作嗅觉原理的非外消旋芳基取代的α-甲基二氢
肉桂醛衍
生物(Lilial™、Helional™)是通过使用克隆和过表达的烯还原酶酶促还原相应的
肉桂醛前体而获得的。使用来自
枯草芽孢杆菌的老黄酶 (OYE) 同源物 YqjM 和来自番茄的
12-氧代植物二烯酸还原酶同工酶 OPR1(e.e.max 53%)获得 (R)-对映体,并且 (S)-醛提供最多97% 有效量使用同工酶 OPR3、来自运动发酵单胞菌的烟酰胺
2-环己烯-1-酮还原酶 NCR 和酵母 OYE 同工酶 1–3,在
叔丁基甲基醚作为共溶剂的情况下,在优化的反应条件下进行。使用 NCR 和 OYE 1–3 还原
α-甲基肉桂醛的立体
化学结果 [之前报告为 (R)] 明确更正为 (S)。