4-芳基-2,3-二氢-4 H-嘧啶并[2,3- b ]苯并噻唑的合成及不对称酰基或羧基转移反应的催化性能
摘要:
合成了4-Aryl-2,3-dihydro-4 H -pyrimido [2,3- b ]苯并噻唑(4-Ar-DHPBs),它们在仲醇动力学和Steglich动力学拆分中具有催化活性和选择性重排和相关反应进行了评估。4-芳基-DHPB在1-苯基乙醇的酰基动力学拆分中显示出低的对映选择性。相反,他们以适中至优异的对映选择性催化了Steglich重排,证明了通过在DHPB的4位上引入取代基进行远程立体控制的可能性。
Asymmetric Hydrogenation of β-Secondary Amino Ketones Catalyzed by a Ruthenocenyl Phosphino-oxazoline-ruthenium Complex (RuPHOX-Ru): the Synthesis of γ-Secondary Amino Alcohols
hydrogenation of β-secondary aminoketones, directly affording the corresponding chiral γ-secondary aminoalcohols in up to 99% yield and with 99% ee. Reaction with β-(benzylamino)-1-phenylpropan-1-one could be performed on a gram-scale with a relatively low catalyst loading (up to 2000 S/C). The resulting hydrogenated product could be used for the synthesis of synthetically useful compounds.
钌烯基膦基-恶唑啉-钌络合物(RuPHOX-Ru)成功应用于β-仲氨基酮的不对称加氢反应,直接制得相应的手性γ-仲氨基醇,收率高达99%,ee为99%。与β-(苄氨基)-1-苯基丙烷-1-酮的反应可以以克为单位进行,催化剂的负载相对较低(最高2000 S / C)。所得的氢化产物可用于合成有用的化合物。
Synthesis and Catalytic Properties of 4-Aryl-2,3-dihydro-4<i>H</i>-pyrimido[2,3-<i>b</i>]benzothiazoles for Asymmetric Acyl or Carboxyl Group Transfer Reactions
4-Aryl-2,3-dihydro-4H-pyrimido[2,3-b]benzothiazoles (4-Ar-DHPBs) were synthesized and their catalytic activity and selectivity in kinetic resolution of a secondary alcohol as well as in the Steglich rearrangement and related reactions were evaluated. 4-Aryl-DHPBs showed low enantioselectivity in the acylative kinetic resolution of 1-phenylethanol. Conversely, they catalyzed the Steglich rearrangement
合成了4-Aryl-2,3-dihydro-4 H -pyrimido [2,3- b ]苯并噻唑(4-Ar-DHPBs),它们在仲醇动力学和Steglich动力学拆分中具有催化活性和选择性重排和相关反应进行了评估。4-芳基-DHPB在1-苯基乙醇的酰基动力学拆分中显示出低的对映选择性。相反,他们以适中至优异的对映选择性催化了Steglich重排,证明了通过在DHPB的4位上引入取代基进行远程立体控制的可能性。