Wagner−Meerwein Skeletal Rearrangement of 3-Spiroannulated 6,8a-Epoxy- and 6,8a;7,8-Diepoxyisoquinolines (3-Aza-11-oxatricyclo[6.2.1.01,6]undec-9-enes). Isolation and Identification of 5-Aza-2-oxatricyclo[6.2.1.03,9]undec-3-enes
摘要:
The reactions of 3-acetyl-3-aza-11-oxatricyclo[6.2.1.0(1,6)]undec-9-ene and its 9,10-epoxy derivative with bromine and Ac2O/BF3.OEt2 under different conditions were studied. Unusual products of Wagner-Meerwein rearrangement bearing the olefin fragment (5-aza-2-oxatricyclo[6.2.1.0(3,9)] undecen-3-enes) were isolated and characterized by X-ray analysis.
Synthesis of 3-spiroannulated hexahydro-6,8a-epoxyisoquinolines
摘要:
The title compounds were synthesised by the intramolecular [4+2]-cycloaddition of 1-N-furfurylarnino-1-allylcyclanes in the presence of acetic anhydride.
Intramolecular Diels—Alder reaction of 4-(N-furfuryl)aminobut-1-enes. New approach to the synthesis of 6,8a-epoxyoctahydroisoquinoline (3-aza-11-oxatricyclo[6.2.1.0<sup>1,6</sup>]undec-9-ene) derivatives
作者:F. I. Zubkov、E. V. Nikitina、K. F. Turchin、A. A. Safronova、R. S. Borisov、A. V. Varlamov
DOI:10.1023/b:rucb.0000037856.61928.c4
日期:2004.4
The intramolecularDiels—Alder reaction of readily accessible 4-substituted 4-(N-furfuryl)aminobut-1-enes was studied and a new one-step method was developed for the synthesis of 6,8a-epoxy-1,2,3,4,4a,5,6,8a-octahydroisoquinoline (3-aza-11-oxatricyclo[6.2.1.01,6]undec-9-ene) derivatives. The [4+2]-cycloaddition proceeds stereoselectively to form exo-adducts. The influence of substituents at the nitrogen