Highly regioselective alkylation of sugar hydroxyl groups has always been an important challenge in carbohydrate chemistry, especially for the selective alkylation of trans diols, there is no direct and efficient catalytic method so far. A chiral copper catalyzed universal highly site-selective alkylation of trans-diols method is realized. This reaction is performed under mild conditions and has broad
Tin-Mediated Regioselective Benzylation and Allylation of Polyols: Applicability of a Catalytic Approach Under Solvent-Free Conditions
作者:Maddalena Giordano、Alfonso Iadonisi
DOI:10.1021/jo402399n
日期:2014.1.3
The first catalytic version of the stannylene-mediated benzylation and allylation of polyols is reported. The methodology is based on a simple solvent-free protocol that significantly advances, in terms of both experimental ease and synthetic scope, the applicability of tin-promoted selective protections. The described approach is indeed endowed with a very large number of advantages over routine protocols:
Petrakova, Eva; Schraml, Jan, Collection of Czechoslovak Chemical Communications, 1983, vol. 48, # 3, p. 877 - 888
作者:Petrakova, Eva、Schraml, Jan
DOI:——
日期:——
3-Hydroxyazetidine Carboxylic Acids: Non-Proteinogenic Amino Acids for Medicinal Chemists
作者:Andreas F. G. Glawar、Sarah F. Jenkinson、Amber L. Thompson、Shinpei Nakagawa、Atsushi Kato、Terry D. Butters、George W. J. Fleet
DOI:10.1002/cmdc.201200541
日期:2013.4
4‐iminoribonic acid is the first chemical synthesis of unprotected 3‐hydroxyazetidine carboxylic acids. The long‐term stability of 3‐hydroxyazetidine amides is established at acidic and neutral pH and implies their value as non‐proteinogenic amino acid components of peptides, providing medicinal chemists with a new class of peptide isosteres. The structure of N,3‐O‐dibenzyl‐2,4‐dideoxy‐2,4‐imino‐D‐ribonic
2,4-二脱氧-2,4-亚氨基核糖酸的两种对映异构体由D-葡萄糖形成是未受保护的 3-羟基氮杂环丁烷羧酸的首次化学合成。3-羟基氮杂环丁烷酰胺在酸性和中性 pH 值下的长期稳定性表明它们作为肽的非蛋白氨基酸组分的价值,为药物化学家提供了一类新的肽等排体。的结构Ñ,3- ö二苄基-2,4-二脱氧-2,4-亚氨基- d -ribonic酸通过X射线结晶分析确定。一个ñ-甲基氮杂环丁烷酰胺衍生物是微摩尔水平的 β-氨基己糖苷酶的特异性抑制剂,并且是与亚氨基糖相关的糖氨基酸的酰胺对任何糖苷酶有效抑制的第二个例子。