(Formula presented) The intramolecular Diels-Alder (IMDA) reactions of C(8)-substituted decatrienoates have been studied. The stereospecific formation of 11 via an endo-boat-9 transition state attests to the powerful directing influence of a C(8) substituent in the IMDA of decatrienoate. In addition, the contrasting observations that stereospecific 9 → 11 occurs at room temperature while the nor-tert-butyl substrate (4a) requires 125 °C/5 h reaction conditions and produces a 60:40 mixture of diastereomers provide clear evidence that a bulky C(8) substituent is a powerful conformational activator of the IMDA.
|Original language||English (US)|
|Number of pages||4|
|State||Published - Jun 29 2000|
ASJC Scopus subject areas
- Molecular Medicine