Stereoselective Coupling of Prochiral Radicals with a Chiral <i>C</i><sub>2</sub>-Symmetric Nitroxide
作者:Rebecca Braslau、Neeta Naik、Hendrik Zipse
DOI:10.1021/ja000520u
日期:2000.9.1
The coupling reaction between a chiral C2-symmetric nitroxide, trans-2,5-dimethyl-2,5-diphenylpyrrolidin-1-oxyl (DPPO; 1), and a series of stabilized secondary prochiral radicals was studied to determine the factors that affect stereoselectivity. Both steric and electronic perturbations on the selectivity by the substituents of the prochiral radical were observed. The effects of temperature, solvent
Oxidative cyclization of 2-allenyl-1,1′-biphenyls with α-carbonyl alkyl bromides: facile access to functionalized phenanthrenes
作者:Cheng-Yong Wang、Gao-Hui Pan、Fan Chen、Jin-Heng Li
DOI:10.1039/c7cc00483d
日期:——
A new copper-facilitated oxidative cyclization of 2-allenyl-1,1′-biphenyls with α-carbonyl alkyl bromides for producing functionalized phenanthrenes is presented, which represents the first allene 2,3-dicarbofunctionalization triggered by oxidative radical-medicated C3-addition of the terminal allene moiety and C–Br/C–H functionalization.
Palladium-Catalyzed Oxidative Difunctionalization of Alkenes with α-Carbonyl Alkyl Bromides Initiated through a Heck-type Insertion: A Route to Indolin-2-ones
作者:Jian-Hong Fan、Wen-Ting Wei、Ming-Bo Zhou、Ren-Jie Song、Jin-Heng Li
DOI:10.1002/anie.201402893
日期:2014.6.23
palladium‐catalyzed oxidative difunctionalization reaction of alkenes with α‐carbonyl alkyl bromides is described, in which the σ‐alkyl palladium(II) intermediate is generated through a Heck insertion and trapped using an aryl C(sp2)H bond. This method can be applied to various α‐carbonyl alkyl bromides, including primary, secondary, and tertiary α‐bromoalkyl esters, ketones, and amides.
Copper-Catalyzed Intermolecular Aminoalkylation of Alkenes with α-Bromoalkyl Esters and Amines toward Pyrrolidin-2-ones
作者:Gao-Hui Pan、Xuan-Hui Ouyang、Ming Hu、Ye-Xiang Xie、Jin-Heng Li
DOI:10.1002/adsc.201700365
日期:2017.8.7
We here describe a new copper‐catalyzed tandem annulation of alkenes with α‐bromoalkyl esters and primaryamines for producing polysubstituted pyrrolidin‐2‐ones. The reaction allows the formation of three new chemical bonds, one C–C bond and two C–N bonds, in a single reaction, and represents the first three‐component difunctionalization of alkenes for the synthesis of pyrrolidin‐2‐ones involving [2+2+1]
Synthesis of Bulky 1,1‐Diarylalkanes by Copper‐Catalyzed 1,2‐Alkylarylation of Styrenes with
<i>α</i>
‐Carbonyl Alkyl Bromides and Arenes involving C−H Functionalization
作者:Shu‐Zheng Luo、Man‐Yi Min、Yan‐Chen Wu、Shuai‐Shuai Jiang、Yu‐Ting Xiao、Ren‐Jie Song、Jin‐Heng Li
DOI:10.1002/adsc.202000363
日期:2020.7.29
of styrenes with α‐carbonyl alkyl bromides and arenes for producing highly bulky 1,1‐diarylalkane derivatives has been developed. In this transformations, two new C−C bonds were formed in a single reaction step through C−Br bond cleavage and C(sp 2)−H functionalization. This protocol tolerates a variety of α‐carbonyl alkyl bromides, including primary, secondary and tertiary α‐bromoalkyl ketone esters