一种新颖的环醚化过程,涉及通过γ-羟基分子通过末端氮丙啶环的分子内开放来轻松实现5 - exo S N 2型闭环,从而立体合成6-氨基-2,5-脱水-6-脱氧-d-甘露糖酸(1)。低聚1通过溶液相肽偶合方法得到的低聚物2 - 5。尽管大多数低聚物(无论是保护形式还是脱保护形式)均未显示任何显着的二级结构,但在MeOH和TFE中,八聚体5(P = H)的CD光谱在216 nm处显示出非常强的正谱带,表明存在解决方案中是否存在有序结构。其1但是,在各种极性溶剂中的1 H NMR谱图未能显示出酰胺质子化学位移的任何明显分散。化合物1 - 5被发现在大鼠降血糖测试无效。
一种新颖的环醚化过程,涉及通过γ-羟基分子通过末端氮丙啶环的分子内开放来轻松实现5 - exo S N 2型闭环,从而立体合成6-氨基-2,5-脱水-6-脱氧-d-甘露糖酸(1)。低聚1通过溶液相肽偶合方法得到的低聚物2 - 5。尽管大多数低聚物(无论是保护形式还是脱保护形式)均未显示任何显着的二级结构,但在MeOH和TFE中,八聚体5(P = H)的CD光谱在216 nm处显示出非常强的正谱带,表明存在解决方案中是否存在有序结构。其1但是,在各种极性溶剂中的1 H NMR谱图未能显示出酰胺质子化学位移的任何明显分散。化合物1 - 5被发现在大鼠降血糖测试无效。
Novel peptides comprising furanoid sugar amino acids for the treatment of cancer
申请人:Prasad Sudhanand
公开号:US20050032707A1
公开(公告)日:2005-02-10
Anticancer peptides which incorporate furanoid sugar amino acids and compositions made using these peptides are described. Methods for synthesis of the peptides and for preparing the furanoid sugar amino acids are disclosed. The peptides and compositions made using the peptides have pharmacological applications of these peptides especially in the treatment and prevention of cancer and tumors.
Stereoselective Total Synthesis of (+)-Varitriol, (−)-Varitriol, 5′-<i>epi</i>-(+)-Varitriol, and 4′-<i>epi</i>-(−)-Varitriol from <scp>d</scp>-Mannitol
作者:Subhash Ghosh、Tapan Kumar Pradhan
DOI:10.1021/jo100001p
日期:2010.3.19
Stereoselective total syntheses of natural (+)-varitriol (1), (−)-varitriol (2), 5′-epi-(+)-varitriol (3), and 4′-epi-(−)-varitriol (4) have been accomplished with use of d-mannitol as a chiral pool material. The Heck reaction was used to assemble the olefinic sugar moiety and the aromatic triflate moiety.
Inversion of regioselectivity in reactions of diols through the use of hexamethylenestannylene acetals as intermediates
作者:T.Bruce Grindley、Xianqi Kong
DOI:10.1016/s0040-4039(00)73960-8
日期:1993.8
Hexamethylenestannylene acetals obtained from a variety of carbohydrate-derived terminal 1,2-diols give good to excellent regioselectivity for tosylation at the secondary oxygen. In contrast, non-cyclic dialkylstannylene acetals react mainly at the primary oxygen. These results are attributed to the greater stability of the dominant stannylene acetal dimers for hexamethylenestannylene acetals.
Synthesis and conformational studies of 3,4-di-O-acylated furanoid sugar amino acid-containing analogs of the receptor binding inhibitor of vasoactive intestinal peptide
Structural analysis of the di-O-caprylated Gaa-containing analog of the receptor binding inhibitors of vasoactive intestinal peptide by various NMR techniques and constrained molecular dynamics (XID) simulation studies established a well-defined beta-turn structure in DMSO-d(6) with an intramolecular hydrogen bond between TyrNH -> MetCO. (c) 2007 Elsevier Ltd. All rights reserved.
Kong, Xianqi; Grindley, T. Bruce, Canadian Journal of Chemistry, 1994, vol. 72, # 12, p. 2396 - 2404