Diastereocontrol of the claisen rearrangement by substituents external to the pericyclic array: Synthetic studies on betaenone B and stemphyloxin I
作者:Daniel V. Pratt、Paul B. Hopkins
DOI:10.1016/s0040-4039(00)96286-5
日期:1987.1
Thermal Claisenrearrangement of substrates 5 and 6, each prepared in seven steps from the Diels-Alder adduct of methoxybenzoquinone and 1,3-butadiene, affords products 7 and 8, respectively. These disparate results demonstrate that the stereochemical outcome of Claisenrearrangements of this type may be controlled by the spatial requirements of substituents external to the pericyclic array.