Chemo-Enzymatic Oxidative Rearrangement of Tertiary Allylic Alcohols: Synthetic Application and Integration into a Cascade Process
作者:Elisabetta Brenna、Michele Crotti、Matteo De Pieri、Francesco G. Gatti、Gabriele Manenti、Daniela Monti
DOI:10.1002/adsc.201800299
日期:2018.10.4
developed to easily transform a cyclopentenone derivative into trans‐Magnolione® and dehydro‐Magnolione®. The rearrangement of exocyclic allylic alcohols was tested as well, and a dynamic kinetic resolution was observed: α,β‐unsaturated ketones with (E)‐configuration and a high diastereomeric excess were synthesized. Finally, the 2,2,6,6‐tetramethyl‐1‐piperidinium tetrafluoroborate (TEMPO+BF4−)/laccase
化学-酶促催化体系,由包括波比茨的盐和漆酶的变色栓菌,允许在水性介质中的氧气气氛下将环内烯丙基叔醇[1,3]-氧化重排成相应的烯酮。在大多数情况下,产率是定量的,特别是对于在侧链上没有吸电子基团(EWG)的环戊2烯1醇或环己2烯1醇底物。相反,通过使用固定的漆酶制剂,在乙腈中进行在侧链带有EWG的大环烯醇或叔醇的转座。脱氢Jasmone®,脱氢Hedione®,脱氢麝香酮和其它香味前体直接与此方法制得,而合成路线的开发是为了容易地转化环戊烯酮衍生物进反式Magnolione®和脱氢Magnolione® 。还测试了环外烯丙基醇的重排,并观察到动态动力学拆分:合成了具有(E)-构型和高非对映异构体过量的α,β-不饱和酮。最后,将2,2,6,6-四甲基-1-哌啶四氟硼酸(TEMPO + BF 4 -)/漆酶催化的氧化重排与烯还原酶/醇脱氢酶级联过程结合在一起,进行一锅三步合成在两种情况下均具有