Synthesis of Sterically Hindered α-Hydroxycarbonyls through Radical–Radical Coupling
作者:Kenji Ota、Kazunori Nagao、Hirohisa Ohmiya
DOI:10.1021/acs.orglett.1c01358
日期:2021.6.4
describe a synthetic approach to sterically hindered α-hydroxy carbonyl compounds through radical–radical coupling. An organic photoredox catalysis reaction converts an aliphatic carboxylic acid and α-ketocarbonyl to a transient alkyl radical and a persistent ketyl radical, respectively, which couple selectively based on the persistent radical effect. This protocol allows the use of primary, secondary, and
Characterization of a methoxylated oxazol-5-one derivative : an unexpected by-product in a dehydropeptide synthesis
作者:Alvin C. Bach、Alysia A. Baldwin、Lila M. Gierasch、Arnold L. Rheingold
DOI:10.1039/c39830001398
日期:——
During the synthesis of the oxazol-5-onederivative (2) of t-butoxycarbonyl-glycyl-2,3-didehydrophenylalanine, the unexpected side product the 2-methoxyoxazol-5-one (3) was isolated and subsequently characterized by n.m.r., i.r., and single-crystal X-ray diffraction analysis.
Asymmetric Synthesis of Functionalizable Type II β-Turn-Inducing α-Amino Acid Building Blocks
作者:Wenzheng Gao、Jiaxin Han、Sophie Greaves、Joseph P. A. Harrity
DOI:10.1021/acs.orglett.3c02376
日期:2023.9.8
α-amino acids, and in so doing, the side chain is sacrificed during the ring-forming process. We report a new asymmetric approach to lactam-constrained α-amino acid building blocks bearing a range of polar and hydrophobic side chains. The chemistry is amenable to rapidly generating di- and tripeptides, and the potential for these lactams to stabilize type II β-turns is demonstrated in the synthesis of the
肽模拟物正在成为一类有前途的有效和选择性疗法。在目前这些化合物的方法中,限制性内酰胺的利用是增强活性肽构象的关键因素,开发有效和立体控制的方法来生成此类内酰胺结构单元是一个重要目标。目前的方法通常依赖于现有 α-氨基酸的精制,这样做时,侧链在成环过程中被牺牲。我们报告了一种新的不对称方法,用于构建带有一系列极性和疏水侧链的内酰胺限制的 α-氨基酸结构单元。该化学物质适合快速生成二肽和三肽,并且这些内酰胺稳定 II 型 β 转角的潜力在黑素细胞抑制因子拟肽的合成中得到了证明。
New Amine-masking Groups for Peptide Synthesis
作者:Frank C. McKay、Noel F. Albertson
DOI:10.1021/ja01574a029
日期:1957.9
Preparation of esters of amino acids and of peptides under mild conditions