79664-59-8Relevant academic research and scientific papers
Synthesis of 6-Methoxy-2,5-dimethyl-2H-isoindole-4,7-dione, an Alkaloid from Reniera Species
Schubert-Zsilavecz, Manfred,Schramm, Hans Wolfgang
, p. 973 (2007/10/02)
6-Methoxy-2,5-dimethyl-2H-isoindole-4,7-dione (4) can easily be obtained in high yields in a one-pot synthesis by heating sarcosine (2) and paraformaldehyde in the presence of 3-methoxy-2-methyl-1,4-benzoquinone (1). Key Words: Alkaloids / Isoindole derivative / 1,3-Dipolar cycloaddition / Reniera species
Synthetic Application of Cyanoaminosilanes as Azomethine Ylide Equivalents
Padwa, Albert,Chen, Yon-Yih,Dent, William,Nimmesgern, Hildegard
, p. 4006 - 4014 (2007/10/02)
A series of α-cyanoaminosilanes have been found to act as azomethine ylide equivalents.Treatment of these compounds with silver fluoride in the presence of electron-dificient alkynes and olefins gives substituted pyrroles and pyrrolidines in high yield.It was found that N-benzyl-N-(cyanomethyl)-N-amine undergoes stereospecific cycloaddition with dimethyl fumarate and maleate.The stereospecificity of the reaction is consistent with a concerted cycloaddition reaction.The cycloaddition behavior of an unsymmetrically substituted α-cyanosilylamine with methyl propiolate was also examined and found to react with high overall regioselectivity.The synthetic utility of cyanoaminosilanes as azomethine ylide equivalents was demonstrated by the preparation of a Reniera isoindole alkaloid.The key step in the synthesis involved the reaction of 2-methyl-3-methoxyquinone with N-methyl-N-(cyanomethyl)-N-amine in the presence of silver fluoride to give 2,5-dimethyl-6-methoxy-2H-isoindole-4,7-dione in good yield.
CYCLOADDITIONS OF NON-STABILIZED AZOMETHINE YLIDES AND QUINONES SYNTHESIS OF THE RENIERA ISOINDOLE
Parker, Kathlyn A.,Cohen, Isaac D.,Padwa, Albert,Dent, William
, p. 4917 - 4920 (2007/10/02)
Azomethyne ylides, generated from cyanomethylamino silanes and excess silver fluoride, undergo cycloaddition with quinones to give, after oxidation in situ, quinonoid isoindoles.This reaction provides the key step for a short, high yield synthesis of the
