Asymmetric synthesis of tetrahydroisoquinolines by enzymatic Pictet–Spengler reaction
作者:Masakatsu Nishihachijo、Yoshinori Hirai、Shigeru Kawano、Akira Nishiyama、Hiromichi Minami、Takane Katayama、Yoshihiko Yasohara、Fumihiko Sato、Hidehiko Kumagai
DOI:10.1080/09168451.2014.890039
日期:2014.4.3
Norcoclaurine synthase (NCS) catalyzes the stereoselective Pictet-Spengler reaction between dopamine and 4-hydroxyphenylacetaldehyde as the first step of benzylisoquinoline alkaloid synthesis in plants. Recent studies suggested that NCS shows relatively relaxed substrate specificity toward aldehydes, and thus, the enzyme can serve as a tool to synthesize unnatural, optically active tetrahydroisoquinolines
Norcoclaurine合酶(NCS)催化多巴胺和4-羟基苯基乙醛之间的立体选择性Pictet-Spengler反应,这是植物中苄基异喹啉生物碱合成的第一步。最近的研究表明,NCS对醛显示相对宽松的底物特异性,因此,该酶可以用作合成非天然光学活性四氢异喹啉的工具。在这项研究中,我们使用了在大肠杆菌中表达的来自黄连的N末端截短的NCS,我们研究了该酶的醛底物特异性。在这里,我们通过合成6,7-二羟基-1-苯乙基-1,2,3,4-四氢异喹啉和6,7-二羟基-1-丙基-1,2,3,4-四氢异喹啉来证明酶的多功能性摩尔产率分别为86.0和99.6%,对映体过量分别为95.3和98.0%。