Asymmetric Synthesis of the Highly Methylated Tryptophan Portion of the Hemiasterlin Tripeptides
摘要:
[GRAPHICS]The asymmetric synthesis of the methylated tryptophan portion of hemiasterlin peptides is described. The key reactions are a SnCl4-mediated ring opening of epoxynitriles or epoxysulfones by N-methylindole followed by an asymmetric Strecker reaction. A second approach involving opening of glycidic esters by indoles is also described.
Asymmetric Synthesis of the Highly Methylated Tryptophan Portion of the Hemiasterlin Tripeptides
摘要:
[GRAPHICS]The asymmetric synthesis of the methylated tryptophan portion of hemiasterlin peptides is described. The key reactions are a SnCl4-mediated ring opening of epoxynitriles or epoxysulfones by N-methylindole followed by an asymmetric Strecker reaction. A second approach involving opening of glycidic esters by indoles is also described.