Bb. Shankar et al., INDOLOCARBAZOLES .3. SYNTHESIS OF NOVEL AZA ANALOGS OF STAUROSPORINE AND K-252A AS PKC INHIBITORS, Bioorganic & medicinal chemistry letters, 4(3), 1994, pp. 495-498
Indolocarbazole 4 and arcyriaflavin A 19 reacted under basic condition
s with 1-benzyl-2,6-bis (benzotriazolyl)-piperidine to give 5 and 20.
As an extension of this methodology other related his benzotriazole de
rivatives were synthesized and coupled with 19 to obtain a variety of
aza derivatives 3. N-debenzylation of these compounds gave novel PKC i
nhibitors.