Bacillus stearothermophilus acetylacetoin synthase: A new catalyst for C–C bond formation
作者:Pier Paolo Giovannini、Paola Pedrini、Valentina Venturi、Giancarlo Fantin、Alessandro Medici
DOI:10.1016/j.molcatb.2010.03.001
日期:2010.6
The synthesis of α-hydroxy-1,3-diketones 2 and 3 from the corresponding 1,2-diketones with Bacillus stearothermophilus ATCC2027 acetylacetoin synthase (AAS) was described. The enzyme catalyzed the condensation of the dialkyl- or alkyl-aryl-1,2-diketones 1 with the elimination of a carboxylic acid moiety. The reactions were carried out using either one diketone both acting as donor and acceptor (homo-coupling)
描述了用嗜热脂肪芽孢杆菌ATCC2027乙酰丙酮合成酶(AAS)从相应的1,2-二酮合成α-羟基-1,3-二酮2和3。该酶催化二烷基-或烷基-芳基-1,2-二酮1的缩合并消除了羧酸部分。使用既充当供体又受主的二酮(均相偶联)或使用两种不同的反应物种(交叉偶联)进行反应。不对称二烷基-1,2-二酮1c – d的均偶联反应提供了区域异构体2(30–42%,ee 67–70%)和3的混合物(19–25%),而使用2,3-丁二酮1a,3,4仅获得1,3-二酮2a(57%),2b(60%)和2e(45%,ee 76%)-己二酮1b和1-苯基-1,2-丙二酮1e。二酮1a和1b以及1b和1e的交叉偶联反应使用不同比例的供体和受体进行。在这两种情况下,唯一的交叉偶联产物是3-乙基-3-羟基-2,4-己二酮4(62%,ee 91%)。