Nitrile oxide-azaheptafulvene adducts consist of rapidly equilibrating mixtures of fused (1) and spiro (2) isomers, the relative stabilities of which are nicely reproduced by B3LYP/ 6-3 1 G(.) calculations. The reaction between these compounds and MTAD affords only two diastereomeric adducts [9 (dominant) and 10], both deriving from the reaction of MTAD with I even in cases in which that isomer could not be detected by NMR spectroscopy. These adducts are formal Diels-Alder adducts deriving from attacks on the two diastereotopic faces of the triene moiety of 1 and involving only the diene system adjacent to the amino substituent (N-4-C-4n=C-5-C-8=C-7). The structures of the adducts are firmly supported by spectroscopic data and X-ray analysis, and so previous incorrect assignments are revised. The mechanism of the reaction between MTAD and I is briefly discussed.
The reaction of acetone with nitrogen tetroxide
作者:Laurence I. Peterson、Edgar C. Britton
DOI:10.1016/s0040-4039(01)99785-0
日期:1966.1
A convergent total synthesis of (+)-phyllanthocin
作者:Stephen F. Martin、Michael S. Dappen、Brian Dupre、Christopher J. Murphy
DOI:10.1021/jo00392a046
日期:1987.8
MARTIN, STEPHEN F.;DAPPEN, MICHAEL S.;DUPRE, BRIAN;MURPHY, CHRISTOPHER J.+, J. ORG. CHEM., 54,(1989) N, C. 2209-2216
作者:MARTIN, STEPHEN F.、DAPPEN, MICHAEL S.、DUPRE, BRIAN、MURPHY, CHRISTOPHER J.+