Synthesis of 5-Iodo-1,2,3,4-tetrahydropyridines by Rhodium-Catalyzed Tandem Nucleophilic Attacks Involving 1-Sulfonyl-1,2,3-triazoles and Iodides
作者:Zengming Man、Haican Dai、Yinping Shi、Dongdong Yang、Chuan-Ying Li
DOI:10.1021/acs.orglett.6b02428
日期:2016.10.7
Sodium iodide is used for the first time as a nucleophile to trap an α-imino rhodium carbene, which triggers a tandem process involving intermolecular nucleophilic attack and intramolecular SN2 reaction. A series of 5-iodo-1,2,3,4-tetrahydropyridines are obtained in high yield, and the synthetic utility of the products is demonstrated in cross-coupling reactions and the construction of biorelated polycyclic
碘化钠首次用作亲核试剂来捕获α-亚氨基铑卡宾,这引发了涉及分子间亲核攻击和分子内S N 2反应的串联过程。以高收率获得了一系列的5-碘-1,2,3,4-四氢吡啶,并且在交叉偶联反应和生物相关多环化合物的构建中证明了该产物的合成效用。
Concise Synthesis of 3-Arylpiperidines
作者:Meng-Yang Chang、Ru-Ting Hsu、Hua-Ping Chen、Pei-Jung Lin
DOI:10.3987/com-06-10717
日期:——
We present an easy and straightforward synthesis of 3-arylpiperidines by Grignard addition of piperidin-3-one with different arylmagnesium bromide reagents and acidic dehydroxylation of the resulting tertiary alcohol with the combination of triethylsilane and boron trifluoride etherate. This facile strategy was further used to synthesize preclamol. A highly regioselective dehydration of 3-arylpiperidin-3-ol
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
Highly Stereoselective Metal-Free Oxyaminations Using Chiral Hypervalent Iodine Reagents
作者:Umar Farid、Thomas Wirth
DOI:10.1002/anie.201107703
日期:2012.4.2
The ring and I: Hypervalentiodine compounds avoid the issues of toxicity or complicated ligands of many transition‐metal‐based systems. A highly enantioselective oxyamination of alkenes with N‐sulfonyl ureas employing chiral, lactic acid‐based hypervalentiodinereagents gives a facile synthesis of enantiomerically pure 2‐arylproline derivatives (see scheme) for the first time.