Visible-light-promoted radical alkylation/cyclization of allylic amide with N-hydroxyphthalimide ester: Synthesis of oxazolines
作者:Zhiyang Yan、Bin Sun、Panyi Huang、Haiyun Zhao、Hao Ding、Weike Su、Can Jin
DOI:10.1016/j.cclet.2021.09.067
日期:2022.4
An efficient photocatalytic alkylation/cyclization of allylic amide with N-hydroxyphthalimide ester has been developed. The transformation is taken advantage of alkyl radicals to attack allylic amide with the assist of inexpensive rose bengal as photocatalyst to prepare a series of alkyl substituted oxazolines in moderate to excellent yields. High regioselectivity, operational safety, mild conditions
Chiral Hetero- and Carbocyclic Compounds from the Asymmetric Hydrogenation of Cyclic Alkenes
作者:J. Johan Verendel、Jia-Qi Li、Xu Quan、Byron Peters、Taigang Zhou、Odd R. Gautun、Thavendran Govender、Pher G. Andersson
DOI:10.1002/chem.201104073
日期:2012.5.21
Several types of chiral hetero‐ and carbocycliccompounds have been synthesized by using the asymmetrichydrogenation of cyclicalkenes. N,P‐Ligated iridium catalysts reduced six‐membered cyclicalkenes with various substituents and heterofunctionality in good to excellent enantioselectivity, whereas the reduction of five‐membered cyclicalkenes was generally less selective, giving modest enantiomeric
Sulfonylative alkoxyhydroxylation of 2-arylpropenes
作者:Huei-Sin Wang、Yan-Shin Wu、Meng-Yang Chang
DOI:10.1016/j.tet.2017.09.047
日期:2017.11
2-arylpropenes 1 affords oxygenated sulfonylcumenes 4 in moderate yields via a sequential route: (i) NBS-mediated allylic bromination of 2-arylpropenes 1 in CH2Cl2, (ii) sodium sulfinates 2-promoted nucleophilic substitution of the resulting styryl bromides in a co-solvent of alcohol and water, and (iii) V2O5/H2O2 mediated alkoxyhydroxylation of corresponding styryl sulfones 3 in alcohol. The synthetic route provides
一键式三步合成2-芳基丙烯1的磺酰化烷氧基羟基化反应可通过以下顺序以中等收率得到含氧的磺酰基枯烯4:(i)NBS介导的CH 2 Cl 2中2-芳基丙烯1的烯丙基溴化,(ii)亚磺酸钠2醇和水的共溶剂中苯乙烯基溴化物的亲核取代反应得到促进;以及(iii)V 2 O 5 / H 2 O 2介导的相应苯乙烯基砜3的烷氧基羟化反应在酒精中。合成路线通过两个碳-氧和一个碳-硫键的形成为2-芳基丙烯1的1,2,3-三氟官能化提供了高效的方法。
Intermolecular Aminoallylation of Alkenes Using Allyl-Oxyphthalimide Derivatives: A Case Study in Radical Polarity Effects
作者:Samuel W. Lardy、Valerie A. Schmidt
DOI:10.1002/ejoc.201901071
日期:2019.10.31
This work describes the essential radicalpolarityeffects manifested in pursuit of a group transfer radical addition to achieve alkeneaminoallylation. Each open shell intermediate along the proposed mechanistic pathway is steered to preferentially react with only one reagent.
chiral dirhodium-carboxylates-catalyzed asymmetric nitrene/alkynemetathesis (NAM) cascade reaction of alkyne-tethered sulfamates has been developed, which provides a general access to the synthesis of tricyclic N-heterocycles in good yields and excellent enantioselectivity. The chiral dirhodium catalyst not only promotes the nitrene/alkynemetathesis (NAM) to generate the key α-imino metal carbene intermediate