Enantioselective Access to Chiral 2-Substituted 2,3-Dihydrobenzo[1,4]dioxane Derivatives through Rh-Catalyzed Asymmetric Hydrogenation
作者:Xuguang Yin、Yi Huang、Ziyi Chen、Yang Hu、Lin Tao、Qingyang Zhao、Xiu-Qin Dong、Xumu Zhang
DOI:10.1021/acs.orglett.8b01469
日期:2018.7.20
Rh-catalyzed asymmetric hydrogenation of various benzo[b][1,4]dioxine derivatives was successfully developed to prepare chiral 2-substituted 2,3-dihydrobenzo[1,4]dioxane derivatives using ZhaoPhos and N-methylation of ZhaoPhos ligands with high yields and excellent enantioselectivities (up to 99% yield, >99% enantiomeric excess (ee), turnover number (TON) = 24 000). Moreover, this asymmetric hydrogenation
成功开发了Rh催化的各种苯并[ b ] [1,4]二恶英衍生物的不对称加氢反应,以使用ZhaoPhos和具有高取代度的ZhaoPhos配体的N-甲基化来制备手性2取代的2,3-二氢苯并[1,4]二恶烷衍生物。收率和出色的对映选择性(高达99%的收率,> 99%的对映体过量(ee),周转数(TON)= 24000)。此外,这种不对称氢化方法作为高达10000吨的关键步骤,已成功地用于开发高效的合成路线,以构建一些重要的生物活性分子,例如MKC-242,WB4101,BSF-190555和(R)-恶唑烷·HCl。