Enantioselective Synthesis of Allenes by Catalytic Traceless Petasis Reactions
作者:Yao Jiang、Abdallah B. Diagne、Regan J. Thomson、Scott E. Schaus
DOI:10.1021/jacs.6b11937
日期:2017.2.8
Allenes are useful functional groups in synthesis as a result of their inherent chemical properties and established reactivity patterns. One property of chemical bonding renders 1,3-substituted allenes chiral, making them attractive targets for asymmetric synthesis. While there are many enantioselective methods to synthesize chiral allenes from chiral starting materials, fewer methods exist to directly
Reformatsky Reaction to Alkynyl <i>N</i>-<i>tert</i>-Butanesulfinyl Imines: Lewis Acid Controlled Stereodivergent Synthesis of β-Alkynyl-β-Amino Acids
作者:Luis Fernández-Sánchez、José A. Fernández-Salas、M. Carmen Maestro、Jose L. García Ruano
DOI:10.1021/acs.joc.8b01918
日期:2018.10.19
highly diastereoselective Refortmatsky reaction to N-tert-butanesulfinyl propargylaldimines and ketimines is presented. The reaction proceeded with excellent yields and diastereoselectivities provided by the sulfinyl group in the presence of Me3Al. The use of TBSOTf as a Lewis acid promoter switched the sense of the stereoinduction. Thus, this methodology allowed the stereodivergent asymmetric synthesis
Iron(III)-catalyzed synthesis of 3-aroylimidazo[1,2-a]pyridines from 2-aminopyridines and ynals
作者:Zhengwang Chen、Botao Liu、Pei Liang、Zhixiong Yang、Min Ye
DOI:10.1016/j.tetlet.2018.01.018
日期:2018.2
An efficient iron-catalyzed intermolecular aminooxygenation of 2-aminopyridines with a wide range of ynals has been developed. 3-Aroylimidazo[1,2-a]pyridines containing various functional groups are synthesized under the standard conditions. The transformation is conducted in simple conditions and forms products in good yields.
已经开发了具有广泛的烯醛的2-氨基吡啶的有效铁催化的分子间氨基氧化。在标准条件下合成含有各种官能团的3-芳基咪唑并[1,2- a ]吡啶。该转化在简单的条件下进行,并以高收率形成产物。
Phosphine-Mediated Dimerization of Conjugated Ene-Yne Ketones: Stereoselective Construction of Dihydrobenzofurans
作者:Cheng-Zhi Zhu、Yao-Liang Sun、Yin Wei、Min Shi
DOI:10.1002/adsc.201700031
日期:2017.4.17
A new strategy for the phosphine‐mediated dimerization of conjugated ene‐yne ketones to produce functionalized dihydrobenzofurans has been developed, affording diversified 4,5‐dihydrobenzofurans in moderate to excellent yields with high diastereoselectivities under mild conditions. This new synthetic method can tolerate a variety of functional groups and can be performed on a gram scale and in an asymmetric
Herein, we report a catalyticenantioselectiveaddition of C-alkynyl imines with hydroperoxides catalyzed by chiral BINOL calcium phosphate, affording a broad range of enantioenriched α-peroxy propargylamines in good yields (80–99%) with high enantioselectivities (up to 94% ee). The protocol is characterized by mild conditions, easy accessibility and good practicability.