Collect. Czech. Chem. Commun. 1987, 52, 215-222

2α,3α-Dihydroxy-7-oxa-6-oxo-B-homo-5α-pregnan-21-oic acid and its derivatives as brassinolide analogues

Václav Černýa, Jaroslav Zajíčeka and Miroslav Strnadb

a Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6
b Institute of Experimental Botany, Czechoslovak Academy of Sciences, 772 00 Olomouc


The synthesis of compounds VIIIb,c,f,h and their plant growth-promoting activity is reported. These compounds differ from the previously described substances Ia-d by the absence of the 21-methyl group, this structural change resulting in a dramatic decrease in the growth-promoting activity.