Microwave Promoted Transcarbamylation Reaction of Sulfonylcarbamates under Continuous-Flow Conditions
摘要:
Successful conditions for the transcarbamylation/transesterification reaction of sulfonylcarbamates with alcohols by microwave heating under continuous flow conditions were developed. After optimization of the processes, two series of O-alkylsulfonylcarbamates were obtained in high yields and purities using microwave transparent borosilicate tube reactors. In order to also illustrate the usefulness of the protocol in a medicinal chemistry context, the methodology was used for the synthesis of three angiotensin II type 2 receptor ligands.
Gold(I)-Catalyzed Highly Regio- and Stereoselective Decarboxylative Amination of Allylic <i>N</i>-Tosylcarbamates via Base-Induced Aza-Claisen Rearrangement in Water
作者:Dong Xing、Dan Yang
DOI:10.1021/ol100056f
日期:2010.3.5
A gold(I)-catalyzed decarboxylative amination of allylic N-tosylcarbamates via base-induced aza-Claisen rearrangement has been developed. A variety of substituted N-tosyl allylic amines were obtained in good yield, excellent regioselectivity, and high to excellent stereoselectivity. This transformation could be performed either in H2O or in one pot directly from allylic alcohols and therefore represents
Iodoamination of Alkenyl Sulfonamides by Potassium Iodide and Hydrogen Peroxide in Aqueous Medium
作者:Sabrina Giofrè、Roberto Sala、Egle Maria Beccalli、Leonardo Lo Presti、Gianluigi Broggini
DOI:10.1002/hlca.201900088
日期:2019.7
A procedure for the iodoamination of unfunctionalized olefins tethered to a tosyl‐protected NH‐group has been developed. The combined use of KI and H2O2 in aqueous medium was effective for the preparation of iodomethyl‐substituted nitrogen‐containing heterocycles. The selective exo‐trig iodocyclization provided 1,2‐bifunctional 5‐, 6‐, and 7‐membered cyclic skeletons.
已经开发了一种方法,用于将未官能化的烯烃束缚在甲苯磺酰基保护的NH-基团上进行碘化。在水性介质中联合使用KI和H 2 O 2可以有效地制备碘甲基取代的含氮杂环。选择性的exo-trig碘环化提供了1,2-双功能的5、6和7元环状骨架。
Palladium(II)-Catalyzed Oxidative Cyclization of Allylic Tosylcarbamates: Scope, Derivatization, and Mechanistic Aspects
作者:Antoine Joosten、Andreas K. Å. Persson、Renaud Millet、Magnus T. Johnson、Jan-E. Bäckvall
DOI:10.1002/chem.201202359
日期:2012.11.19
reoxidation (molecular oxygen) is suitable for this transformation. The title reaction is shown to proceed through overall trans‐amidopalladation of the olefin followed by β‐hydride elimination. This process is scalable and the products are suitable for a range of subsequent transformations such as: kinetic resolution (KR) and oxidative Heck‐, Wacker‐, and metathesis reactions.
Intramolecular Aminoazidation of Unactivated Terminal Alkenes by Palladium-Catalyzed Reactions with Hydrogen Peroxide as the Oxidant
作者:Francesca Foschi、Camilla Loro、Roberto Sala、Julie Oble、Leonardo Lo Presti、Egle M. Beccalli、Giovanni Poli、Gianluigi Broggini
DOI:10.1021/acs.orglett.0c00010
日期:2020.2.21
The palladium-catalyzed aminoazidation of aminoalkenes yielding azidomethyl-substituted nitrogen-containing heterocycles was developed. The procedure requires oxidative conditions and occurs at room temperature in the presence of hydrogen peroxide and NaN3 as the azide source. These conditions provide selective exo-cyclization/azidation of the carbon-carbon double bond, furnishing a versatile approach