Abstract
Investigations of the stem and root bark of
Turraea holstii have yielded the known 1,3-diacetylvilasinin and seven novel limonoids: 11-
epi-toonacilin, 11
β,12
α-diacetoxycedrelone, 12-
O-methylnimbolinin B, 12
α-acetoxyneotrichilenone, 12
α-acetoxy-7-acetyl-1,2-dihydroneotrichilenone, 12
α-acetoxy-1,2-dihydroneotrichilenone and 11
β-acetoxy-7-acetyl-12
α-hydroxy-1,2-dihydroneotrichilenone. The stereochemistry at C-11 in turraflorins A–C from
Turraea floribunda has been revised.