Synthesis of chiral oligopeptides by means of catalytic asymmetric hydrogenation of dehydropeptides
作者:Iwao Ojima、T Noriko Yoda、Momoko Yatabe、Toshiyuki Tanaka、Tetsuo Kogure
DOI:10.1016/s0040-4020(01)82412-1
日期:1984.1
on the asymmetric induction as well as catalyst efficiency. The chiral centers in AA' and AA' amino acid residues in 5 were also found to have some influence on the catalytic asymmetric induction. Possible mechanism which can accommodate these effects are discussed. Asymmetric reduction of RCOCO-AA-OMe (13) via hydrosilylation was carried out to give chiral depsipeptide units. The asymmetric hydrogenation
Ac-ΔTyr(Ac)-(S)-Ala-Gly-OMe(6),Ac-ΔTyr(Ac)-(R)-AlaGly-(S)-Phe-OMe(7),Ac-ΔPhe的不对称氢化-NH-CH(R)CH 2 -OCH 2 Ph(10),HCO-ΔPhe-(S)-Leu-OMe(16),X-AA-ΔPhe-AA'-OMe(5:X t BOC,CBZ ,CF 3 CO; AA,AA” =α氨基酸),和吨BOC-AA-ΔPhe-AA'-NH-Y(21:Y = H,NH-AA'-ΔPhe-AA-吨BOC,NHPh基),由阳离子Rh络合物[L * Rh(NBD)] + ClO 4催化进行(L * =手性二膦),得到具有高立体选择性的相应手性寡肽。发现脱氢三肽(5)的N-保护基团的性质对不对称诱导以及催化剂效率产生了显着影响。还发现5 '的AA'和AA'氨基酸残基中的手性中心对催化不对称诱导有一定影响。讨论了可以适应