Lipase-Catalyzed Domino Kinetic Resolution/Intramolecular Diels–Alder Reaction: One-Pot Synthesis of Optically Active 7-Oxabicyclo[2.2.1]heptenes from Furfuryl Alcohols and -Substituted Acrylic Acids
作者:Shuji Akai、Tadaatsu Naka、Sohei Omura、Kouichi Tanimoto、Masashi Imanishi、Yasushi Takebe、Masato Matsugi、Yasuyuki Kita
DOI:10.1002/1521-3765(20020916)8:18<4255::aid-chem4255>3.0.co;2-6
日期:2002.9.16
The first lipase-catalyzed domino reaction is described in which the acyl moiety formed during the enzymatic kinetic resolution of furfuryl alcohols (+/-)-3 with a 1-ethoxyvinyl ester 2 was utilized as a part of the constituent structure for the subsequent Diels-Alder reaction. The preparation of ester 2 from carboxylic acid 1 and the subsequent domino reaction were carried out in a one-pot reaction
描述了第一次脂肪酶催化的多米诺骨牌反应,其中糠醛醇(+/-)-3与1-乙氧基乙烯基酯2的酶促动力学拆分过程中形成的酰基部分被用作后续Diels的组成结构的一部分-Al醛反应。由羧酸1制备酯2和随后的多米诺反应以一锅法进行。因此,该方法为光学活性的7-氧杂双环[2.2.1]庚烯衍生物5的制备提供了方便,该衍生物具有来自非手性1和外消旋3的五个手性,非外消旋碳中心。该过程的总效率取决于在3的C-3位置的取代基上使用3-甲基糠基衍生物(+/-)-3 b和(+/-)-3 f 仅产生非对映选择性,具有出色的对映选择性,从而获得(2R)-syn-5(91-> / = 99%ee)和(S)-3(96-> / = 99%ee)。从3-溴糠醇(+/-)-3 hj开始的类似程序提供了环加合物(2R)-syn-5 jq(93-> / = 99%ee),其中溴基用于安装7-氧杂双环庚烯核的大取代基。