intramolecular substitutionreaction with alkoxide moiety occurs at the lithium alkylidene carbenoid center to give dihydrofurans. The reaction mechanism of this intramolecular substitutionreaction is studied by B3LYP density functional calculations with the 6-31+G(d) basis set, and the substitution is found to proceed in a concerted manner. This substitutionreaction is applied to the regioselective preparation
The photoaminations of trans-1-arylpropenes and 7-methoxy-1,2-dihydronaphthalenes with ammonia in the presence of dicyanobenzene gave 1-aryl-2-propylamines and 2-amino-6-methoxy-1,2,3,4-tetrahydronaphthalenes, respectively. The yields of the aminated compounds were improved by the addition of 1,3,5-triphenylbenzene or m-terphenyl.
The photoaminations of trans-1-arylpropenes (aryl = 2-methoxyphenyl (1), 3-methoxyphenyl (2), 3,4-dimethoxyphenyl (3), and 4-methoxyphenyl (4)) with NH3, i-PrNH2, and t-BuNH(2) (RNH(2)) in the presence of p-dicyanobenzene (p-DCB) gave 2-alkylamino-1-arylpropanes (9) and/or 2-alkylamino-1-aryl-1-(4-cyanophenyl)propanes (10). The photoaminations of 1,2-dihydro-7-methoxynaphthalenes (6-8) with RNH(2) in the presence of p-DCB gave mainly 2-alkylamino-1-(4-cyanophenyl)-6-methoxy-1,2,3,4-tetrahydronaphthalenes (13). The photoamination of trans-1-(3,5-dimethoxyphenyl)propene (5) with i-PrNH2 occurred at aromatic ring to give trans-1-(2-isopropylamino-3,5-dimethoxyphenyl)propene (11). The photoaminations of 1-4 and 6-8 with NH3 in the presence of m-dicyanobenzene gave the aminated products without incorporation of cyanophenyl group. Furthermore, the addition of 1,3,5-triphenylbenzene and m-terphenyl for these reactions improved the yields of the photoaminated products.
Julia,M.; Labia,R., Bulletin de la Societe Chimique de France, 1972, p. 4151 - 4157