Dehydrobromination of some substituted phenyl 3-bromopropionates and phenyl 3-bromothiolopropionates. Transmission of activation effects through acyl bonds
Starting from Styrene: A Unified Protocol for Hydrotrifluoromethylation of Diversified Alkenes
作者:Yi-Fei Yang、Jin-Hong Lin、Ji-Chang Xiao
DOI:10.1021/acs.orglett.1c03630
日期:2021.12.3
In contrast with unactivated alkenes, the corresponding hydrotrifluoromethylation of styrene has remained challenging due to the strong propensity of styrene for oligomerization and polymerization. On the basis of our newly developed trifluoromethylation reagent, TFSP, herein we present a general method for the hydrotrifluoromethylation of styrene under photoredox catalysis. The substrate scope was
Organocatalytic Enantioselective Synthesis of 2,3-Allenoates by Intermolecular Addition of Nitroalkanes to Activated Enynes
作者:Hui Qian、Xiuzhao Yu、Junliang Zhang、Jianwei Sun
DOI:10.1021/ja409080v
日期:2013.12.4
The first efficient intermolecular addition of nitroalkanes to activated enynes for asymmetric synthesis of 2,3-allenoates is described. It is a new addition to the limited available strategies for catalytic asymmetric synthesis of allenoates. Enabled by a new bifunctional catalyst, a range of trisubstituted allenoates can be obtained in excellent chemical and optical purity. These allenoate products
Efficient Cu-catalyzed Atom Transfer Radical Addition Reactions of Fluoroalkylsulfonyl Chlorides with Electron-deficient Alkenes Induced by Visible Light
作者:Xiao-Jun Tang、William R. Dolbier
DOI:10.1002/anie.201412199
日期:2015.3.27
Fluoroalkylsulfonyl chlorides, RfSO2Cl, in which Rf=CF3, C4F9, CF2H, CH2F, and CH2CF3, are used as a source of fluorinated radicals to add fluoroalkyl groups to electron‐deficient, unsaturated carbonyl compounds. Photochemical conditions, using Cu mediation, are used to produce the respective α‐chloro‐β‐fluoroalkylcarbonyl products in excellent yields through an atom transferradicaladdition (ATRA) process
氟烷基磺酰氯,R f SO 2 Cl,其中R f= CF 3,C 4 F 9,CF 2 H,CH 2 F和CH 2 CF 3,被用作氟自由基的来源以向电子中添加氟烷基。不足的不饱和羰基化合物。通过铜介导的光化学条件,可通过原子转移自由基加成(ATRA)工艺以优异的产率生产相应的α-氯-β-氟代烷基羰基产物。α-氯取代基的容易亲核取代会导致产物进一步多样化的功能。
Acid- and Base-Switched Palladium-Catalyzed γ-C(sp<sup>3</sup>)–H Alkylation and Alkenylation of Neopentylamine
作者:Jinquan Zhang、Shuaizhong Zhang、Hongbin Zou
DOI:10.1021/acs.orglett.1c00903
日期:2021.5.7
unactivated C(sp3)–H and the reaction selectivity are among the core pursuits for transition-metal catalytic system development. Herein, we report Pd-catalyzed γ-C(sp3)–H-selective alkylation and alkenylation with removable 7-azaindole as a directing group. Acid and base were found to be the decisive regulators for the selective alkylation and alkenylation, respectively, on the same single substrate under otherwise
Ti-Catalyzed Radical Alkylation of Secondary and Tertiary Alkyl Chlorides Using Michael Acceptors
作者:Xiangyu Wu、Wei Hao、Ke-Yin Ye、Binyang Jiang、Gisselle Pombar、Zhidong Song、Song Lin
DOI:10.1021/jacs.8b08605
日期:2018.11.7
Alkylchlorides are common functional groups in synthetic organic chemistry. However, the engagement of unactivated alkylchlorides, especially tertiaryalkylchlorides, in transition-metal-catalyzed C-C bond formation remains challenging. Herein, we describe the development of a TiIII-catalyzed radical addition of 2° and 3° alkylchlorides to electron-deficient alkenes. Mechanistic data are consistent