Synthesis of 3-Substituted 3-(Trimethylsiloxy)pyrrolidines from β-Aminoketones and Lithium Trimethylsilyldiazomethane
摘要:
Lithium trimethylsilyldiazomethane reacted with N-benzyl-beta-aminoketones at -78 degrees C in THF to give 3-substituted 1-benzyl-3-(trimethylsiloxy)pyrrolidines in moderate to good yields.
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。
Catalytic Asymmetric Hydrogenation of Tetrasubstituted Unsaturated Lactams: An Efficient Approach to Enantioenriched 3,4-Disubstituted Piperidines
作者:Congcong Yin、Yingmin Pan、Xumu Zhang、Qin Yin
DOI:10.1021/acs.orglett.1c04132
日期:2022.1.21
Asymmetrichydrogenation of tetrasubstituted alkenes remains a formidable challenge in asymmetric catalysis. We report herein an unprecedented Rh-catalyzed enantioselective and diastereoselective hydrogenation of easily accessed α,β-disubstituted unsaturated lactams to afford synthetically valuable chiral lactams with 1,2-consecutive stereocenters. The reaction could be performed on the gram scale