Convenient removal of N-tert-butyl from amides with scandium triflate
摘要:
Scandium triflate has been used as a convenient and efficient catalyst for removal of N-tert-butyl from amide groups. A variety of N-tert-butyl aryl and alkyl amides under these conditions gave the corresponding primary amide in high yields. With the use of microwave heating the deprotection reaction could be completed within I h. (c) 2006 Elsevier Ltd. All rights reserved.
Accessing Difluoromethylated and Trifluoromethylated
<i>cis</i>
‐Cycloalkanes and Saturated Heterocycles: Preferential Hydrogen Addition to the Substitution Sites for Dearomatization
作者:Xue Zhang、Liang Ling、Meiming Luo、Xiaoming Zeng
DOI:10.1002/anie.201907457
日期:2019.11.18
Reported here is a straightforward process in which a cyclic (alkyl)(amino)carbene/Rh catalyst system facilitates the preferential addition of hydrogen to the substitutionsites of difluoromethylated and trifluoromethylated arenes and heteroarenes, leading to dearomative reduction. This strategy enables the diastereoselective synthesis of cis-difluoromethylated and cis-trifluoromethylated cycloalkanes
An Efficient and Scalable Ritter Reaction for the Synthesis of <i>tert</i>-Butyl Amides
作者:Jean C. Baum、Jacqueline E. Milne、Jerry A. Murry、Oliver R. Thiel
DOI:10.1021/jo8024797
日期:2009.3.6
A scalable procedure for the conversion of nitriles to N-tert-butyl amides via the Ritter reaction was optimized employing tert-butyl acetate and aceticacid. The reaction has a broad scope for aromatic, alkyl, and α,β-unsaturated nitriles.
Efficient Approach to Amide Bond Formation with Nitriles and Peroxides: One-Pot Access to Boronated β-Ketoamides
作者:Babasaheb Sopan Gore、Gopal Chandru Senadi、Amol Milind Garkhedkar、Jeh-Jeng Wang
DOI:10.1002/adsc.201700532
日期:2017.9.4
An efficient, mild and practical approach for the synthesis of amides from nitriles and peroxides is reported in the presence of boron trifluoride ethereate. In this protocol, we utilized peroxides as C1 synthons for the amidationreaction. Also, we successfully prepared boron‐containing β‐ketoamides in a one‐pot assembly from β‐ketonitriles. A variety of functional groups were tolerated in moderate
A new and efficient method for the synthesis of amides via palladium-catalyzed C−C coupling of arylhalides with isocyanides is reported, by which a series of amides were formed from readily available starting materials under mild conditions. This transformation could extend its use to the synthesis of natural products and significant pharmaceuticals.
Carboxylate-Assisted Iridium-Catalyzed C−H Amination of Arenes with Biologically Relevant Alkyl Azides
作者:Tao Zhang、Xuejiao Hu、Zhen Wang、Tiantian Yang、Hao Sun、Guigen Li、Hongjian Lu
DOI:10.1002/chem.201504880
日期:2016.2.24
wide substrate scope is reported. Benzamides with electron‐donating and ‐withdrawing groups and linear, branched, and cyclic alkyl azides are all applicable. Cesium carboxylate is crucial for both reactivity and regioselectivity of the reactions. Many biologically relevant molecules, such as amino acid, peptide, steroid, sugar, and thymidine derivatives can be introduced to arenes with high yields and