Asymmetric synthesis of (3S)-2,3,4,5-tetrahydropyridazine-3-carboxylic acid
作者:Ian H. Aspinall、Phillip M. Cowley、Glynn Mitchell、Richard J. Stoodley
DOI:10.1039/c39930001179
日期:——
The title compound 1a is prepared by a two-step sequence from the cycloadduct 5d, derived from di(tert-butyl) azodicarboxylate and the diene 4b by a hetero Diels-Alder reaction.
Dehydrooligopeptides. XVI. Convenient Syntheses of Two Kinds of Antrimycins Av and Dv Containing Dehydrovaline Residues
作者:Yutaka Nakamura、Akio Ito、Chung-gi Shin
DOI:10.1246/bcsj.67.2151
日期:1994.8
Eight kinds of peptide antibiotics, antrimycins (1), consist of four sorts of unusual α-amino acids, that is, hydroxymethylserine, (2S,3S)-2,3-diaminobutanoic acid, (S)-2,3,4,5-tetrahydro-3-pyridazinecarboxylic acid, and dehydrovaline (ΔVal) or (E)-dehydroisoleucine (ΔIle) from the N-terminus of 1. The practical syntheses of the three segments containing these four acids, and all of the protected 1 by the usual fragment condensations of the three segments were accomplished. Moreover, after mild deprotection of the protecting groups, the two kinds of 1, antrimycins Av and Dv comprising Ala5–ΔVal6 and Leu5–ΔVal6 segments respectively, were synthesized.
Useful Syntheses of (3<i>S</i>)-2,3,4,5-Tetrahydropyridazine-3-carboxylic Acid and Its Dehydrotetrapeptide Derivatives
作者:Yutaka Nakamura、Chung-gi Shin
DOI:10.1246/cl.1991.1953
日期:1991.11
The stereoselective synthesis of (3S)-2,3,4,5-tetrahydropyridazine-3-carboxylic acid (Pya), which is a cyclic α-amino acid at center of antrimycins (1), was successful. Moreover, the synthesis of the C-terminal dehydrotetrapeptide of 1 containing Pya residue at N-terminus is described.
(3S)-2,3,4,5-四氢哒嗪-3-羧酸 (Pya) 的立体选择性合成是成功的,它是一种位于抗霉素 (1) 中心的环状 α-氨基酸。此外,还描述了在 N 端含有 Pya 残基的 1 的 C 端脱氢四肽的合成。
Aspinall, Ian H.; Cowley, Phillip M.; Mitchell, Glynn, Journal of the Chemical Society. Perkin transactions I, 1999, # 18, p. 2591 - 2599
作者:Aspinall, Ian H.、Cowley, Phillip M.、Mitchell, Glynn、Rajnor, Clive M.、Stoodley, Richard J.