Enantiospecific synthesis of (-)-tabtoxinine .beta.-lactam
摘要:
A convergent, 10-step synthesis of optically active tabtoxinine beta-lactam [(-)-1] has been described. Key features of the synthetic route include (1) preparation of a new gamma-cation amino acid synthon, (-)-4, and its use as an electrophile (3 --> 11); (2) the one-pot conversion of methyl sulfide 11 to the Cbz-protected amine 12 via stereoselective sulfilimine rearrangement; and (3) chemoselective lactone ring opening in spiro lactam 15a. Synthons (-)-4 and 3 are available on a semipreparative scale.
Enantiospecific synthesis of (-)-tabtoxinine .beta.-lactam
摘要:
A convergent, 10-step synthesis of optically active tabtoxinine beta-lactam [(-)-1] has been described. Key features of the synthetic route include (1) preparation of a new gamma-cation amino acid synthon, (-)-4, and its use as an electrophile (3 --> 11); (2) the one-pot conversion of methyl sulfide 11 to the Cbz-protected amine 12 via stereoselective sulfilimine rearrangement; and (3) chemoselective lactone ring opening in spiro lactam 15a. Synthons (-)-4 and 3 are available on a semipreparative scale.