Abstract:Synthese der Verbindungen 1-9 und Testung auf Aktivitat an der P388D, Tumorzellinie werden beschrieben. Stark wirksam sind die P-Aminoketone 2-4, 7 und 9, die in der a-Stellung eine zusatzliche Aminomethylgruppierung besitzen.
Tumor Inhibiting P-AminoketonesSynthesis of the compounds 1-9 and testing for activity against the P388Dl tumor celline are described. The p-aminoketones 2-4, 7 and 9, which bear an additional aminomethyl group in a-position. are strongly active.p-Aminoketone besitzen ein breites Wirkspe… Show more
“…-In the case of 5a no tetrahydro product was isolated. 5,6,12, [2,l-a] 5,6,12,9, [2,l- 5,6,12,3, [2,l- 5,6,12,3, [2,1a lisoquinoline 5,6,12,3,9, [2,lalisoquinoline (60 M.p. 105-107° (lit.…”
Section: General Procedures For the Ring Closure Of The Bromo-tetrahydmentioning
Methoxy-indolo[2,l-a]isoquinolines 8a-f and their dihydroderivatives 7a-f were synthesized by Bischler-Napieralski reaction of the (bromomethoxyphenyl)-[2-(methoxyphenyl)-ethyl]acetamides 4a-f, reduction, subsequent cyclization and dehydrogenation. They were tested for cytostatic activity in vitro using P388 D x leukemia and MDA MB 231 mammary tumor cells. The trimethoxy-5,6-dihydroindoloisoquinoline 7d and the tetramethoxyindoloisoquinoline 8f showed an inhibition of cellproliferation of about 70 % at a concentration of 10" 5 molar. The aim of our investigations is the synthesis of cytostatic compounds with binding affinity for the estrogen receptor, that can be used for the selective treatment of hormone dependent mammary tumors. Suitable structures for this approach are tetracyclic N-heterocycles, which are known to intercalate into the DNA 1 ) and are able to bind to the estrogen receptor 2 ).Based on these findings, we synthesized a number of indolo[2,l-a]isoquinolines 8a-f and their dihydro analogues 7a-f. Cytostatic activity of these compounds was evaluated in vitro using MDA-MB 231 mammary tumor cells and P388 D 1 leukemia cells.
ChemistryThe synthesis was performed as outlined in scheme 1. The starting methyl bromophenylacetates 2a-c were synthesized by bromination of the corresponding phenylacetic acids and conversion to the methyl esters. The 2-phenylethylamine 3a was obtained directly by LiAlH 4 reduction of the 3-methoxy-ß-nitrostyrene 3) or, in better yield, in two steps with NaBH 4 followed by LiAlH 4 . The best method was the hydrogenation of the 3-methoxy-phenylacetonitrile with Rh/C.The reaction of the bromo-phenylacetates 2a-c with the 2-phenylethylamines 3a and 3b afforded the corresponding amides 4a-f. Cyclisation to the 3,4-dihydroisoquinolines was accomplished by a modified Bischler-Napieralski method using POCl 3 in CH 3 CN. The crude products were treated with NaBH 4 to give the 1,2,3,4-tetrahydro-l-benzylisoquinolines 5a-f. In the case of 4c (2-Bromo-4,5-dimethoxyphenyl)-(3,4-dihydro-6-methoxyisoquinolyl-l)-ketone was formed as a byproduct, probably by air oxidation 4) . The correct substitution pattern in the isoquinoline ring was confirmed by ^-NMR spectroscopy.The benzylisoquinolines 5a-f were converted into the tetracyclic indolo[2,l-a]isoquinolines by treatment with NaH in DMSO. This reaction must involve a benzyne intermediate 5) because both bromo compounds 5a and 5b led to the same structure. The reaction mixture contained two products
“…-In the case of 5a no tetrahydro product was isolated. 5,6,12, [2,l-a] 5,6,12,9, [2,l- 5,6,12,3, [2,l- 5,6,12,3, [2,1a lisoquinoline 5,6,12,3,9, [2,lalisoquinoline (60 M.p. 105-107° (lit.…”
Section: General Procedures For the Ring Closure Of The Bromo-tetrahydmentioning
Methoxy-indolo[2,l-a]isoquinolines 8a-f and their dihydroderivatives 7a-f were synthesized by Bischler-Napieralski reaction of the (bromomethoxyphenyl)-[2-(methoxyphenyl)-ethyl]acetamides 4a-f, reduction, subsequent cyclization and dehydrogenation. They were tested for cytostatic activity in vitro using P388 D x leukemia and MDA MB 231 mammary tumor cells. The trimethoxy-5,6-dihydroindoloisoquinoline 7d and the tetramethoxyindoloisoquinoline 8f showed an inhibition of cellproliferation of about 70 % at a concentration of 10" 5 molar. The aim of our investigations is the synthesis of cytostatic compounds with binding affinity for the estrogen receptor, that can be used for the selective treatment of hormone dependent mammary tumors. Suitable structures for this approach are tetracyclic N-heterocycles, which are known to intercalate into the DNA 1 ) and are able to bind to the estrogen receptor 2 ).Based on these findings, we synthesized a number of indolo[2,l-a]isoquinolines 8a-f and their dihydro analogues 7a-f. Cytostatic activity of these compounds was evaluated in vitro using MDA-MB 231 mammary tumor cells and P388 D 1 leukemia cells.
ChemistryThe synthesis was performed as outlined in scheme 1. The starting methyl bromophenylacetates 2a-c were synthesized by bromination of the corresponding phenylacetic acids and conversion to the methyl esters. The 2-phenylethylamine 3a was obtained directly by LiAlH 4 reduction of the 3-methoxy-ß-nitrostyrene 3) or, in better yield, in two steps with NaBH 4 followed by LiAlH 4 . The best method was the hydrogenation of the 3-methoxy-phenylacetonitrile with Rh/C.The reaction of the bromo-phenylacetates 2a-c with the 2-phenylethylamines 3a and 3b afforded the corresponding amides 4a-f. Cyclisation to the 3,4-dihydroisoquinolines was accomplished by a modified Bischler-Napieralski method using POCl 3 in CH 3 CN. The crude products were treated with NaBH 4 to give the 1,2,3,4-tetrahydro-l-benzylisoquinolines 5a-f. In the case of 4c (2-Bromo-4,5-dimethoxyphenyl)-(3,4-dihydro-6-methoxyisoquinolyl-l)-ketone was formed as a byproduct, probably by air oxidation 4) . The correct substitution pattern in the isoquinoline ring was confirmed by ^-NMR spectroscopy.The benzylisoquinolines 5a-f were converted into the tetracyclic indolo[2,l-a]isoquinolines by treatment with NaH in DMSO. This reaction must involve a benzyne intermediate 5) because both bromo compounds 5a and 5b led to the same structure. The reaction mixture contained two products
A series of substituted acetophenones, paraformaldehyde, and symmetrical dialkylamines were used in microwave enhanced Mannich reactions. Appropriate reaction conditions in terms of choice of solvent, reaction temperature, and reaction time were studied to allow a fast and reproducible production of Mannich bases. Both small (2 mmol) and large scale reactions (40 mmol) were performed successfully, providing a series of substituted Mannich bases in moderate to high yields and high purity.
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