A practical and inexpensive ‘convertible’ isonitrile for use in multicomponent reactions
摘要:
N-tert-Butylamides are readily converted into the corresponding carboxylic acids by simple nitrosation. The process, which occurs under mild nonaqueous conditions, leaves carboxylic esters untouched and transforms multicomponent reaction products into useful building blocks for further synthetic elaboration. (C) 2010 Elsevier Ltd. All rights reserved.
Three-Component Visible-Light-Induced Palladium-Catalyzed 1,2-Alkyl Carbamoylation/Cyanation of Alkenes
作者:Xiangqing Jia、Ziyan Zhang、Vladimir Gevorgyan
DOI:10.1021/acscatal.1c04183
日期:2021.11.5
three-component alkyl-carbamoylation and cyanation of alkenes was developed. This general transformation, which proceeds via the in situ formation of a reactive ketenimine intermediate, allows for a rapid construction of a broad range of valuable amides and nitriles from readily available alkenes, alkyl iodides, and isocyanides. An efficient synthesis of tetrazole and amidine via this approach was also
The invention provides compounds of formula (I):
wherein R
1
-R
3
, n, and W have any of the values defined in the specification, and salts thereof. The compounds have good solubility and are useful for treating bacterial infections.
times, the use of strong protic acids in aqueous media, toxicity and tedious work-up Either isobutylene or t-butanol in the presence of acid is employed to generate the tbutyl cation. In spite of this widely used method, some inherent problems exist; for example, the exothermic reaction of isobutylene, a gas, with acids and its susceptibility to subsequent cationic polymerization. Another complication
Amine-boranes as Dual-Purpose Reagents for Direct Amidation of Carboxylic Acids
作者:P. Veeraraghavan Ramachandran、Henry J. Hamann、Shivani Choudhary
DOI:10.1021/acs.orglett.0c03184
日期:2020.11.6
Amine-boranes serve as dual-purpose reagents for direct amidation, activating aliphatic and aromatic carboxylicacids and, subsequently, delivering amines to provide the corresponding amides in up to 99% yields. Delivery of gaseous or low-boiling amines as their borane complexes provides a major advantage over existing methodologies. Utilizing amine-boranes containing borane incompatible functionalities
Palladium-Catalyzed Amidation of N-Tosylhydrazones with Isocyanides
作者:Fengtao Zhou、Ke Ding、Qian Cai
DOI:10.1002/chem.201102459
日期:2011.10.24
N‐tosylhydrazones: The direct formation of keteniminesfromcarbenes and isocyanides is limited to the reaction of Fischer carbene complexes or some specially stabilized carbenes with isocyanides. A Pd‐catalyzed amidation of N‐tosylhydrazones with isocyanides via a ketenimine intermediate in the presence of water is described. The method offers a general way to synthesize amides from carbonyl compounds through one‐carbon