Synthesis of novel chiral guanidine catalyst and its application in the asymmetric Pictet-Spengler reaction
作者:Saeed Ahmad、Lakshmi Shukla、Joanna Szawkało、Piotr Roszkowski、Jan K. Maurin、Zbigniew Czarnocki
DOI:10.1016/j.catcom.2016.10.008
日期:2017.1
A new chiral guanidine catalyst has been synthesized by the reaction of (R)-1-(1-phenylethyl)guanidine and 2,3-diphenylcycloprop-2-enone. The catalyst was evaluated for the Pictet-Spenglerreaction in which tetrahydro-β-carbolines were obtained in good yields with up to 64% ee.
Highly Enantioselective Pictet-Spengler Reaction Catalyzed by SPINOL-Phosphoric Acids
作者:Dan Huang、Fangxi Xu、Xufeng Lin、Yanguang Wang
DOI:10.1002/chem.201103207
日期:2012.3.12
enantioselective catalysts for the asymmetric Pictet–Spengler reaction of Nb‐α‐naphthylmethyl tryptamines with a series of aliphatic and aromatic aldehydes, affording opticallyactive tetrahydro‐β‐carbolines in excellent yields and ee values. The current protocol has been applied in the asymmetric total synthesis of (−)‐harmicine.
手性SPINOL-磷酸是N b -α-萘甲基甲基色胺与一系列脂族和芳族醛的不对称Pictet-Spengler反应的高度对映选择性催化剂,可提供具有优异收率和ee值的旋光四氢-β-咔啉。当前协议已应用于(-)-甜菜碱的不对称总合成中。
Copper‐Catalyzed Chemoselective Divergent Carbene Insertion into the N−H bonds of Tryptamines
作者:Dharmendra Kumar、Malleswara Rao Kuram
DOI:10.1002/adsc.202300893
日期:2023.11.21
synthesis. Herein, we have developed a chemoselective copper-catalyzed carbene insertion protocol onto N−H bonds of tryptamine derivatives. Divergent insertion products are obtained by varying the nucleophilicity of the aliphatic NH of tryptamine with electron-donating or electron-withdrawing groups. The reaction provided N−H insertion products with broad substrate scope in good yields.