InCl3-mediated coupling of delta-alkoxy allylic stannane 9b with aldeh
ydes has been shown to give the a-coupling products in high yield, pro
bably via two S-E' processes. Most specifically, drimenal (rac-1) has
been converted into labdane derivative 17 which is considered to be an
important intermediate on the way to forskolin. (C) 1997 Published by
Elsevier Science Ltd.