In the preparation of phosphate prodrugs of PD154075, several strategies of
linking a phosphate group to the indole moiety were studied, A novel linke
r, p-hydroxymethylbenzoyloxymethoxycarbonyl was discovered to provide the p
hosphate prodrug of PD154075 (compound 9) with significantly increased aque
ous solubility, sufficient stability in aqueous solution and good bio-recon
version in vivo, (C) 2000 Elsevier Science Ltd. All rights reserved.