New endomorphin-2 (EM-2) analogues incorporating (Z)-α,β-didehydrophenylalanine (ΔZPhe) in place of the native phenylalanine in EM-2 are reported. Tyr-Pro-ΔZPhe-Phe-NH2 [ΔZPhe3]EM-2} (1), Tyr-Pro-Phe-ΔZPhe-NH2 [ΔZPhe4]EM-2} (2), and Tyr-Pro-ΔZPhe-ΔZPhe-NH2 [ΔZPhe3,4]EM-2}(3) have been synthesized, their opioid receptor binding affinities and tissue bioassay activities were determined, and their
新的内吗啡肽-2 (EM-2) 类似物包含 ( Z )-α,β-二脱氢苯丙氨酸( ΔZ Phe) 代替 EM-2 中的天然苯丙氨酸。Tyr-Pro-Δ Z Phe-Phe-NH 2 [Δ Z Phe 3 ]EM-2} ( 1 )、Tyr-Pro-Phe-Δ Z Phe-NH 2 [Δ Z Phe 4 ]EM-2} ( 2 ) 和 Tyr-Pro-Δ Z Phe-Δ Z Phe-NH 2 [Δ Z Phe 3,4 ]EM-2}( 3) 已经合成,它们的阿片受体结合亲和力和组织生物测定活性被确定,并且它们的构象特性被检查。化合物2显示出与天然肽相当的高 μ 阿片受体选择性和 μ 激动剂活性。报道了N -Boc-Tyr-Pro- ΔZ Phe-Phe-NH 2 ( 8 )在溶液和晶体中采用的构象。
Synthesis of chiral tripeptides by asymmetric hydrogenation of dehydrotripeptides. Remarkable effects of N-protecting groups on stereoselectivity and reactivity
作者:Iwao Ojima、Noriko Yoda
DOI:10.1016/s0040-4039(00)87741-2
日期:——
Synthesis of chiral oligopeptides by means of catalytic asymmetric hydrogenation of dehydropeptides
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. Asymmetricreduction of RCOCO-AA-OMe (13) via hydrosilylation was carried out to give chiral depsipeptide units. The asymmetric hydrogenation