scholarly journals Low-Temperature, Transition-Metal-Free Cross-Dehydrogenative Coupling Protocol for the Synthesis of 3,3-Disubstituted Oxindoles

2017 ◽  
Vol 82 (20) ◽  
pp. 11288-11294 ◽  
Author(s):  
James R. Donald ◽  
Richard J. K. Taylor ◽  
Wade F. Petersen
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Temperature Transition ◽  
Metal Free ◽  
Dehydrogenative Coupling

LOW-TEMPERATURE TRANSITION METAL-SEMICONDUCTOR IN CdCr2Se4 SINGLE CRYSTALS DOPED WITH INDIUM AND GALLIUM

1980 ◽  
Vol 41 (C5) ◽  
pp. C5-155-C5-156 ◽  
Author(s):  
T. G. Aminov ◽  
K. P. Below ◽  
V. T. Kalinnikov ◽  
L. I. Koroleva ◽  
L. N. Tovmasjan
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Single Crystals ◽  
Temperature Transition

scholarly journals Synthesis of 2-oxindoles via 'transition-metal-free' intramolecular dehydrogenative coupling (IDC) of sp2 C–H and sp3 C–H bonds

2016 ◽  
Vol 12 ◽  
pp. 1153-1169 ◽  
Author(s):  
Nivesh Kumar ◽  
Santanu Ghosh ◽  
Subhajit Bhunia ◽  
Alakesh Bisai
Keyword(s):  
Transition Metal ◽  
Alkyl Halides ◽  
One Pot ◽  
Metal Free ◽  
Quaternary Center ◽  
Dehydrogenative Coupling ◽  
Carbon Carbon Bonds ◽  
Carbon Bonds

The synthesis of a variety of 2-oxindoles bearing an all-carbon quaternary center at the pseudo benzylic position has been achieved via a ‘transition-metal-free’ intramolecular dehydrogenative coupling (IDC). The construction of 2-oxindole moieties was carried out through formation of carbon–carbon bonds using KOt-Bu-catalyzed one pot C-alkylation of β-N-arylamido esters with alkyl halides followed by a dehydrogenative coupling. Experimental evidences indicated toward a radical-mediated path for this reaction.

scholarly journals Transition-metal-free C(sp3)–H/C(sp3)–H dehydrogenative coupling of saturated heterocycles with N-benzyl imines

2020 ◽  
Vol 11 (29) ◽  
pp. 7619-7625 ◽  
Author(s):  
Zhengfen Liu ◽  
Minyan Li ◽  
Guogang Deng ◽  
Wanshi Wei ◽  
Ping Feng ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Transition Metal ◽  
Electron Donors ◽  
Metal Free ◽  
Aryl Radicals ◽  
Dehydrogenative Coupling ◽  
Saturated Heterocycles

A unique transition-metal-free C(sp3)–H/C(sp3)–H dehydrocoupling of N-benzylimines with saturated heterocycles is presented using 2-azaallyl anions as super electron donors to initiate the generation of hydrogen atom abstracting aryl radicals.

(Diacetoxyiodo)benzene-Mediated Transition-Metal-Free Amination of C(sp3)–H Bonds Adjacent to Heteroatoms with Azoles: Synthesis of N-Alkylated Azoles

Synlett ◽  
2018 ◽  
Vol 29 (18) ◽  
pp. 2432-2436 ◽  
Author(s):  
Can Jin ◽  
Weike Su ◽  
Bin Sun ◽  
Zhiyang Yan
Keyword(s):  
Free Radical ◽  
Transition Metal ◽  
Coupling Reaction ◽  
Metal Catalyst ◽  
Metal Free ◽  
Alternative Method ◽  
Dehydrogenative Coupling ◽  
Wide Range ◽  
Ready Access

A novel PhI(OAc)2-mediated cross-dehydrogenative coupling reaction of α-C(sp3)–H bonds adjacent to a hetero atom with various azoles has been developed, which provides an alternative method for constructing C–N bonds with high atom efficiency. This new protocol requires no metal catalyst and it provides ready access to a wide range of N-alkylated azole derivatives in moderate to excellent yields by using commercially available PhI(OAc)2 as the sole oxidant. Furthermore, the method is effective on a gram scale, which highlights the practicality of this transformation. The result of radical-captured experiments indicated that the transformation might involve a free-radical pathway.

scholarly journals Oxidative cross-dehydrogenative coupling (CDC) via C(sp2)–H bond functionalization: tert-butyl peroxybenzoate (TBPB)-promoted regioselective direct C-3 acylation/benzoylation of 2H-indazoles with aldehydes/benzyl alcohols/styrenes

RSC Advances ◽  
2021 ◽  
Vol 11 (23) ◽  
pp. 14178-14192
Author(s):  
Richa Sharma ◽  
Lalit Yadav ◽  
Ravi Kant Yadav ◽  
Sandeep Chaudhary
Keyword(s):  
Transition Metal ◽  
Benzyl Alcohols ◽  
Bond Functionalization ◽  
Metal Free ◽  
Tert Butyl ◽  
Dehydrogenative Coupling

An efficient transition-metal-free oxidative C(sp2)–H/C(sp2)–H cross-dehydrogenative coupling via C(sp2)–H bond functionalization for regioselective C-3 acylation/benzoylation of 2H-indazoles with aldehydes/benzyl alcohols/styrenes is reported.

Regioselective transition metal-free acylation of coumarins via cross-dehydrogenative coupling reaction of coumarins and aldehydes

2016 ◽  
Vol 57 (33) ◽  
pp. 3701-3705 ◽  
Author(s):  
Mehdi Adib ◽  
Saideh Rajai-Daryasarei ◽  
Rahim Pashazadeh ◽  
Mahnaz Tajik ◽  
Peiman Mirzaei
Keyword(s):  
Transition Metal ◽  
Coupling Reaction ◽  
Metal Free ◽  
Dehydrogenative Coupling
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