The Totally Protected Hydroxy Containing α-Amino Phosphonic Esters and α-Amino Phosphinoxides as well as Their Carbamoyl Derivatives
摘要:
Syntheses of the title compounds by the addition of diethyl phosphite as well as dimethylphosphine oxide in a Strecker-type reaction to the cyclic imines 1,2 followed by conversion to the related N-carbamoyl compounds are described.
在新的三组分一锅法反应中,实现了易于参与的环状亚胺与酰基氯的有效转化,该亚胺能够参与亲核芳香族取代(S N Ar)反应,至少产生三环环化喹唑啉酮,苯并恶嗪酮分别是由于使用了氮,氧或硫亲核试剂而产生的苯并噻嗪酮。特别是在喹唑啉酮的情况下,这种方便的策略使人们能够进入多样性更高的杂环,这为精细杂环骨架的有效衍生化提供了发展。在随后的Heck或Ullmann环化中,可以对所提及的喹唑啉酮进行进一步的环合。
take part in nucleophilic aromatic substitution (SNAr) reactions is realized in a new three-component, one-pot reaction, giving at least tricyclic annulated quinazolinones, benzoxazinones, and benzothiazinones as a result of the employed nitrogen, oxygen, or sulfur nucleophiles, respectively. Especially in the case of quinazolinones, this convenient strategy enables the access to heterocycles of heightened
在新的三组分一锅法反应中,实现了易于参与的环状亚胺与酰基氯的有效转化,该亚胺能够参与亲核芳香族取代(S N Ar)反应,至少产生三环环化喹唑啉酮,苯并恶嗪酮分别是由于使用了氮,氧或硫亲核试剂而产生的苯并噻嗪酮。特别是在喹唑啉酮的情况下,这种方便的策略使人们能够进入多样性更高的杂环,这为精细杂环骨架的有效衍生化提供了发展。在随后的Heck或Ullmann环化中,可以对所提及的喹唑啉酮进行进一步的环合。
Synthesis of β-Oxabutyrolactams Starting from 2,5-Dihydrooxazoles
A new synthetic pathway to generate β-oxabutyrolactams starting from 2,5-dihydrooxazoles is described. This procedure is based on the addition of acid chlorides to heterocyclic imines followed by oxidation in the presence of pyridinium chlorochromate.
A Novel and Convenient Route to Phosphono-Oligopeptides Derived from 1,3-Oxazolines, 1,3-Oxazines and 1,3-Thiazolines
作者:Mostafa Hatam、Davoud Tehranfar、Jürgen Martens
DOI:10.1080/00397919508015852
日期:1995.6
Abstract An efficient and simple method is described based on the Ugi -four component condensation (4CC) reaction for the synthesis of unnatural phosphonooligopepides derived from 1,3-oxazolines, 1,3-thiazolines and 1,3-oxazines.
Single-Step Synthesis of Racemic Di- and Tripeptides Derived from Unnatural β-Hydroxy and β-Mercapto α-Amino, Acids by the Ugi Reaction
作者:M. Hatam、D. Tehranfar、J. Martens
DOI:10.1055/s-1994-25535
日期:——
An efficient single-step selective synthesis of oligopeptide analogues, which contain amino acid analogues and are derivatives of 3-thiazolidines and 3-oxazolidine, through the use of hydrochloric acid as the protecting agent is described. These compounds are prepared based on the Ugi four component condensation (4CC) reaction.
Synthesis of different types of valerolactams starting from 2,5-dihydrooxazoles
作者:Katharina Johannes、Jürgen Martens
DOI:10.1016/j.tet.2009.10.107
日期:2010.1
Tricyclic valerolactams characterized by a variable heteroatom in gamma-position, for example, sulfur, oxygen or nitrogen, were synthesized starting from 2,5-dihydrooxazoles. The chosen synthetic procedures included the addition of thiosalicylic acid as well as the addition of salicyl chloride. The nitrogen containing lactams were prepared in a cycloaddition and subsequent oxidation. (C) 2009 Elsevier Ltd. All rights reserved.