I. Kadas et al., A SHORT AND EFFICIENT ANNELATION SEQUENCE FOR THE SYNTHESIS OF BICYCLIC INTERMEDIATES IN THE TOTAL SYNTHESIS OF STRIGOL AND ITS ANALOGS, Monatshefte fuer Chemie, 127(8-9), 1996, pp. 887-893
A new annelation sequence was developed for the bicyclic diones 2, int
ermediates in the total synthesis of strigol (1) and its analogues. Th
e first step of the sequence is the conjugate addition of nitro alcoho
ls 4 to cyclopentenone 5, followed by an alkylative cyclization step a
nd dehydrogenation.