作者:David J. Bentley、Alexandra M. Z. Slawin、Christopher J. Moody
DOI:10.1021/ol060153c
日期:2006.5.1
beta-carbon link, has been synthesized. The key steps include the formation of this amino acid through a thioxo-oxazolidine intermediate and a Horner-Wadsworth-Emmons reaction using a phosphonoglycine, derived by a dirhodium(II)-catalyzed N-H insertion reaction, to give a dehydroamino acid and subsequent rhodium(I)-catalyzedasymmetric hydrogenation to introduce the modified tryptophan residue.
Asymmetric synthesis of the central tryptophan residue of stephanotic acid
作者:David J. Bentley、Christopher J. Moody
DOI:10.1039/b414996c
日期:——
The C-6 substituted tryptophan di- and tri-peptides 5 and 6, representing the tryptophan core of stephanotic acid, have been synthesized, the key steps being the formation of the phosphono-di- and tri-peptides 8 and 10 by a highly chemoselective rhodium(II) catalyzed carbene N-H insertion reaction, their subsequent Horner–Wadsworth–Emmons reactions with N-Boc-6-bromoindole-3-carboxaldehyde, and the rhodium(I) catalyzed asymmetric hydrogenation of the resulting dehydro di- and tri-peptides.