A short and selective synthesis of C-seco limonoid model insect antifeedant
related to ochinolide was accomplished in seven steps from alpha-cyclocitr
al. The key steps an the electrocyclization of a P-acyl divinyl ketone indu
ced by perchloric acid, and a selective retroclaisen reaction. A rare examp
le of atropisomerism was found in the trisubstituted cyclopentenone 6 key i
ntermediate.