N-Tosylhydrazine-mediated deoxygenative hydrogenation of aldehydes and ketones catalyzed by Pd/C
摘要:
A mild and efficient method for the deoxygenative hydrogenation of aldehydes and ketones has been developed. The reaction is mediated by N-tosylhydrazine with H-2 (1 atm) as the reductant and 10% Pd/C as the catalyst. (C) 2013 Elsevier Ltd. All rights reserved.
Morita–Baylis–Hillman(MBH)醇与偶氮甲亚胺的膦催化串联环化反应已实现,用于合成生物学上重要的(环氧甲氧基)-吡唑并[5,1- b ]喹唑啉衍生物。在温和的反应条件下,多种MBH醇和甲亚胺亚胺具有良好的耐受性,从而以高收率提供了具有出色的非对映选择性的新型3D杂环化合物。这是首次实现了未改性的MBH醇作为新的氧杂合成子的直接活化。
Direct Synthesis of Propen-2-yl Sulfones through Cascade Reactions Using Calcium Carbide as an Alkyne Source
作者:Lei Gao、Zhenrong Liu、Xiaolong Ma、Zheng Li
DOI:10.1021/acs.orglett.0c01915
日期:2020.7.2
A simple method for the construction of propen-2-yl sulfones through cascadereactions of calcium carbide with arylsulfonylhydrazones using copper as a mediator is described. The salient features of this protocol are the use of readily available and easy-to-handle alkyne source, broad substrate scope, open-air condition, and simple operation procedure.
A chiral squaramide-catalyzed asymmetric dearomative tandem annulation reaction through a kinetic resolution of MBH alcohols: highly enantioselective synthesis of three-dimensional heterocyclic compounds
dearomative tandem annulation reaction of unmodified Morita–Baylis–Hillman alcohols with azomethine imines has been achieved through a kinetic resolution of MBH alcohols under mild conditions, giving pharmaceutically interesting functionalized hetero-bicyclo[3.3.1]nonane derivatives in good to excellent yields with excellent enantioselectivities.
A transition‐metal‐free reaction of o‐aminoacetophenone N‐tosylhydrazone and CO2 has been developed, leading to a series of 1,4‐dihydro‐2H‐3,1‐benzoxazin‐2‐ones in moderate to good yields. This procedure proceeds with the sequential fixation of CO2 by amino leading to carbamic acid and the intra‐ molecular insertion of hydroxyl to carbene.
已开发出邻氨基苯乙酮N-甲苯磺酰and与CO 2的无过渡金属反应,从而以中等至良好的产率产生了一系列1,4-二氢-2 H -3,1-苯并恶嗪-2-酮。该过程通过氨基依次固定CO 2导致氨基甲酸和分子内将羟基插入卡宾而进行。
A [4+3] Cycloaddition Reaction of Aza-ortho-quinone Methides with C,N-Cyclic Azomethine Imines for Synthesis of 1,2,4-Triazepines
The base-induced formal [4+3] cycloaddition reaction of C,N-cyclic azomethine imines with aza-ortho-quinone methides, generated in situ, is reported. This protocol provided an efficient method for the synthesis of biologically important 1,2,4-triazepine derivatives, with a wide substrate scope and excellent functional-group tolerance, and it gives moderate to excellent yields under mild conditions
Base-promoted domino reaction for the synthesis of 2,3-disubstituted indoles from 2-aminobenzaldehyde/2-amino aryl ketones, tosylhydrazine, and aromatic aldehydes
A base-promoted domino reaction to synthesize the 2,3-disubstituted indoles from 2-aminobenzaldehyde/2-amino aryl ketones, tosylhydrazine, and aromaticaldehydes has been developed. This strategy provides a simple and beneficial way for the construction of 2,3-disubstituted indole compounds from readily available starting materials under mild conditions.