1539-57-7Relevant academic research and scientific papers
Enantioselective Alkylamination of Unactivated Alkenes under Copper Catalysis
Bai, Zibo,Zhang, Heng,Wang, Hao,Yu, Hanrui,Chen, Gong,He, Gang
supporting information, p. 1195 - 1202 (2021/02/05)
An enantioselective addition reaction of various alkyl groups to unactivated internal alkenes under Cu catalysis has been developed. The reaction uses amide-linked aminoquinoline as the directing group, 4-alkyl Hantzsch esters as the donor of alkyl radicals, and rarely used biaryl diphosphine oxide as a chiral ligand. β-lactams featuring two contiguous stereocenters at Cβ and the β substituent can be obtained in good yield with excellent enantioselectivity. Mechanistic studies indicate that a nucleophilic addition of the alkyl radical to CuII-coordinated alkene is the enantio-determining step.
Visible-light-mediated minisci C-H alkylation of heteroarenes with 4-alkyl-1,4-dihydropyridines using O2as an oxidant
Dong, Jianyang,Liu, Yuxiu,Song, Hongjian,Wang, Qingmin,Xu, Wentao,Yue, Fuyang
supporting information, p. 5599 - 5604 (2020/09/21)
Herein, we report a protocol for direct visible-light-mediated Minisci C-H alkylation reactions of N-heteroarenes with 4-alkyl-1,4-dihydropyridines at room temperature with molecular oxygen as an oxidant. The protocol permits efficient functionalization of various N-heteroarenes with a broad range of cyclic and acyclic primary, secondary, and tertiary alkyl groups and is scalable to the gram level. This mild protocol uses an inexpensive, green oxidant and is suitable for late-stage C-H alkylation of complex nitrogen-containing molecules. We demonstrated its utility by preparing or functionalizing several pharmaceuticals and natural products.
USE OF COMPOSITIONS OBTAINED BY CALCINING PARTICULAR METAL-ACCUMULATING PLANTS FOR IMPLEMENTING CATALYTICAL REACTIONS
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Paragraph 0849-0850, (2016/01/25)
The use of metal-accumulating plants for implementing chemical reactions especially catalytical reactions.
Unprecedented synthesis of hantzsch 1,4-dihydropyridines under biginelli reaction conditions
Yadav,Subba Reddy,Reddy
, p. 425 - 430 (2007/10/03)
Hantzsch 1,4-dihydropyridines are synthesized in high yields by a one-pot cyclocondensation of aldehyde, β-ketoester, and urea on the surface of silica gel under microwave irradiation in solvent-free conditions.
Novel syntheses of heterocycles with N-(1-haloalkyl)azinium halides. Part 2. Preparation of N-unsubstituted 1,4-dihydropyridines
Vanden Eynde,D'Orazio,Mayence,Maquestiau,Anders
, p. 1263 - 1268 (2007/10/02)
N-(1-Chloroalkyl)pyridinium chlorides, prepared from thionyl chloride, pyridine, and aldehydes, readily react with enaminocarbonyl derivatives to yield 1,4-dihydropyridines under mild and neutral conditions.
CARBON TRANSFER REACTIONS WITH HETEROCYCLES-V. A FACILE SYNTHESIS OF NIFEDIPINE AND ANALOGUES
Singh, Harjit,Singh, Kamaljit
, p. 3967 - 3974 (2007/10/02)
Oxazolidines and tetrahydro-(2H)-1,3-oxazines transfer their C(2) units at the carbonyl group oxidation level to alkyl-β-amino/anilinocrotonates to form 1,4-dihydropyridines elaborated at C-4.
