Chemistry of novel compounds with a multifunctional carbon structure. 5. Molecular design of versatile building blocks for aliphatic monofluoro molecules by manipulation of multifunctional carbon structure
fluoronitromethylphosphonate (3) was applied in the Horner–Wadsworth–Emmons reaction with aldehydes and trifluoromethyl ketones to provide new 1‐fluoro‐1‐nitroalkenes with good to high stereoselectivities. Alkylation of 3 was successful only with iodomethane, however, conjugateadditions of 3 to Michael acceptors such as α,β‐unsaturated carbonyl compounds, sulfones, and nitro compounds allowed access to variously
A method for the synthesis of isoxazolinesN-oxidesfrom primary aliphatic nitro compounds and olefins based on the 1,3-dipolar cycloaddition of intermediate 1-halo-substituted silyl nitronates, followed by halosilane elimination has been described. The nature of the halogen atom plays a key role in determining the stability and reactivity of all intermediates of this process. Bromonitro compounds
Enantioselective Synthesis of β-Fluoro Amines via β-Amino α-Fluoro Nitroalkanes and a Traceless Activating Group Strategy
作者:Brandon A. Vara、Jeffrey N. Johnston
DOI:10.1021/jacs.6b07731
日期:2016.10.26
Preparation of a range of enantioenriched β-fluoro amines (α,β-disubstituted) is described in which the nitrogen and fluorine atoms are attached to sp3-hybridized carbons. The key finding is a chiral bifunctional Brønsted acid/base catalyst that can deliver β-amino-α-fluoro nitroalkanes with high enantio- and diastereoselection. A denitration step renders the nitro group "traceless" and delivers secondary
The Michael addition reactions of fluorinated nitro compounds with electron deficient olefins to give γ‐fluoro‐γ‐nitro‐esters, nitriles and ketones which bear a fluorinated quaternary carbon center were reported. The reactions were promoted by TMG, affording the desired adducts in acceptable to good yields.
DBU-catalyzed selective β-addition of α-fluoro nitroalkanes to allenoates
作者:Li-Wen Ning、Yi-Hu Jin、Ren-Jie Wang、Youcan Zhang、Ya Li
DOI:10.1016/j.jfluchem.2024.110255
日期:2024.2
An efficient DBU-catalyzed β-addition of α-fluoro nitroalkane compounds to allenoates has been developed. Both γ-substituted and -unsubstituted allenoates participated in the reaction, giving a series of the β-addition products bearing a stereogenic carbon-fluorine structural unit in very good yields. The practicability of the method was also demonstrated.