Grignard-mediated rearrangement of trifluoroacetyl from dihydroisoquinoline enamides to afford tertiary trifluoromethylcarbinols
作者:Raghavendra Achary、Gangadhar Rao Mathi、Seulgi Kim、Jong Yeon Hwang、Pilho Kim
DOI:10.1039/c7ob03079g
日期:——
trifluoroacetyl enamides of dihydroisoquinolines 2 with diverse Grignard reagents afforded tertiary trifluoromethyl-carbinols 4 by facilitating the addition of tertiary carbinols to the β-carbon of enamides 2. Based on the confirmed formation of vinylogous amides 3, the transformation likely proceeds via unique acyl group rearrangement to the β-carbon of the enamide and subsequent nucleophilic addition of
Several examples of the successful reduction of N-acyl-enamine derivatives with a NADHmodel in the pyrrolo[2,3-b]pyridine series are given. It is shown, that the reduction is strongly dependent on electronic and geometrical factors. It appears that in general, the success of the reduction can be related to the ability of the magnesium ions to form a complex with the acyl group and with the enamine
Intermolecular benzyne cycloaddition (IBC) approach to aporphinoids. Total syntheses of norcepharadione B, cepharadione B, dehydroanonaine, duguenaine, dehydronornuciferine, pontevedrine, O-methylatheroline, lysicamine, and alkaloid PO-3
作者:N. Atanes、L. Castedo、E. Guitian、C. Saa、J. M. Saa、R. Suau
DOI:10.1021/jo00009a010
日期:1991.4
We describe a useful novel approach to the synthesis of aporphinoids, including dehydroaporphines, aristolactams, 4,5-dioxoaporphines, and 7-oxoaporphines, by means of intermolecular benzyne cycloaddition (IBC). Specifically, we report the total synthesis of the isoquinoline alkaloids norcepharadione B, cepharadione B, dehydroanonaine, duguenaine, dehydronornuciferine, pontevedrine, O-methylatheroline, lysicamine, and alkaloid PO-3.
ATANES, N.;CASTEDO, L.;GUITIAN, E.;SAA, C.;SAA, J. M.;SUAU, R., J. ORG. CHEM., 56,(1991) N, C. 2984-2988
作者:ATANES, N.、CASTEDO, L.、GUITIAN, E.、SAA, C.、SAA, J. M.、SUAU, R.