Synthesis of Potential Thrombin Inhibitors. Incorporation of Tartaric Acid Templates as P2 Proline Mimetics
摘要:
With the objective to prepare novel non-peptidic thrombin inhibitors, bioisosteres of the inhibitory tripeptide D-Phe-Pro-Arg chain have been examined. Thus, the P1 Arg was replaced with p-amidinobenzylamine, an elongated homologue of the same and with 2,5-dichloro benzylamine. The P2-P3, D-Phe-Pro, was replaced with a novel tartaric acid template coupled to a series of readily available, mainly lipophilic, amines. Some,of these compounds exhibit promising thrombin inhibition activity in vitro, IC50 similar to5.9 muM. (C) 2002 Elsevier Science Ltd. All rights reserved.
High purity 2-nitroimidazole derivatives having excellent radiosensitivity and high safety and useful as a drug to be used along with radiotherapy of various cancers can be prepared at a high yield from inexpensive diester of tartaric acid according to the following reaction formua, ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each individually represents an aliphatic group or an aromatic group, and X represents a halogen atom.
dialkyl phosphate was synthesized starting from (+)-diethyl tartrate. Its catalytic activity as a chiral Brønsted acid has been examined in the Mannich-type reaction of a ketene silyl acetal with aldimines as a model reaction. The corresponding β-amino acid esters were obtained with high enantioselectivity.
Methoxymethylation of tartrate as a strategy for the synthesis of chiral building blocks
作者:Hervé Dulphy、Jean-Louis Gras、Tore Lejon
DOI:10.1016/0040-4020(96)00409-7
日期:1996.6
Controlled methoxymethylation of tartrate affords mono- and diMOMtartrates. We took advantage of the particular reactivity of methoxymethylethers and of the conformations of the starting C4 unit, to efficiently synthezise various cyclic methyleneketals (dioxane and dioxolane) or cyclic ethers (oxolane and oxetane).
Synthesis of novel enantiomerically pure tetra-carbohydrazide cyclophane macrocycles
作者:Hany F. Nour、Nadim Hourani、Nikolai Kuhnert
DOI:10.1039/c2ob25171j
日期:——
A total of twelve novelenantiomericallypure tetra-carbohydrazide cyclophane macrocycles have been synthesised in quantitative yields by reacting chiral (4R,5R)- and (4S,5S)-1,3-dioxolane-4,5-dicarbohydrazides with aromatic bis-aldehydes in a [2 + 2]-cyclocondensation reaction. The compounds show a dynamic behaviour in solution, which has been rationalized in terms of an unprecedented conformational