合成路线1

A new synthesis of (9S)-9-(hydroxymethyl)-6,7,10,11- tetrahydro-9H,18H-5,21:12,17-dimethenodibenzo[e,k]pyrrolo[3,4-h][1,4,13]oxadiazacyclohexadecine-18,20-dione (XI), a key intermediate in the synthesis of LY-333531, has been reported: Enantiocontrolled condensation of 2-bromoethanol (I) with epoxide (II) by means of a chiral Pd catalyst, triethylborane and DMAP in dichloromethane gives the chiral allyl ether (III), which is protected with TIPS-OTf yielding the silyl ether (IV). Hydroboration of ether (IV) with 9-BBN followed by oxidation with H2O2 provides the primary alcohol (V), which is mesylated with MsCl to afford the mesylate (VI). Mesylate (VI) is cyclized with the bisindolylmaleimide (VII) by means of Cs2CO3 in DMF at 100 C resulting in the macrocyclic compound (VIII). Hydrolysis of (VIII) with KOH, followed by acidic workup yields the anhydride (IX), which by treatment with HMDS in methanolic DMF provides the maleimide (X). Finally, this compound is desilyl-ated with TBAF to afford the target intermediate (XI).