Hydantoin-Free Synthesis of Peptide Ester Isocyanates, Isothiocyanates, and Dipeptidyl Ureas: The Application of Zinc Dust in a Carbonylation Procedure without Base
We have developed two green, practical, and efficient procedures, including a one-pot one, to synthesize isothiocyanates from amines and carbon disulfide via desulfurization with sodium persulfate. Water is used as the solvent. Basic conditions are necessary for good chemoselectivity for isothiocyanates. Structurally diverse linear and branched alkyl amines and aryl amines are readily converted to isothiocyanates
Synthesis of N-urethane protected amino alkyl (S-methyl)-isothiouronium compounds and carbodiimide tethered peptidomimetics: an application for guanidino and substituted guanidino peptidomimetics synthesis
作者:Basavaprabhu Hosamani、N. Narendra、Girish Prabhu、Vommina V. Sureshbabu
DOI:10.1039/c4ra07252a
日期:——
The synthesis of N,N′-disubstituted and N,N′,N′′-trisubstituted guanidine linked peptidomimetic molecules suitably decorated in the peptide backbone has been delineated. Nα-Protected amino acid derived S-methyl isothiouronium derivatives are employed as the key intermediates for the synthesis of guanidinopeptide mimics. Synthesis of a new class of carbodiimide tethered dipeptidomimetics has also been outlined wherein a Staudinger-aza-Wittig type reaction between amino alkyl azide and isothiocyanato esters is employed. Thus obtained carbodiimides have been demonstrated as starting materials for the construction of guanidino peptide mimics as well as an array of trisubstituted guanidine mimetics bearing N-hydroxy, cyano and amino function as third substitutions at the guanidino unit in the backbone.
The article deals with a newsynthesis of 2-thioxo-1,3-imidazolidine derivatives, masked 2,3-diaminosuccinic acids. The described procedure leads to the designed products by an intermolecular Mannich reaction between aldimine (ethyl iminoacetate) and enolates derived from 2-isothiocyanatocarboxylic esters. The prepared heterocyclic products having twostereogeniccenters can be easily separated into
Titanium(IV)-mediated synthesis of 2,3-diisothiocyanato-succinic acid diesters and 3,6-dithioxo-piperazine derivatives
作者:Dariusz Cież
DOI:10.1016/j.tet.2007.03.053
日期:2007.5
Oxidative homocoupling of titanium(IV) enolates of 2-isothiocyanato-carboxylic esters resulted in the synthesis of 2,3-diisothiocyanato-succinic acid diesters. The reactions were carried out using DIPEA/TiCl4 oxidizing system and led to chiral dimers (instead of meso) as main products. Titanium(IV) enolatesderivedfrom hindered 2-isothiocyanato-carboxylates did not undergo the oxidative homocoupling
Synthesis of Novel, Chiral, Water-soluble Isothiazole Derivatives
作者:Dariusz Cież、Edward Szneler
DOI:10.3184/030823407x203396
日期:2007.4
This article describes an easy preparation of some optically active, water soluble N5,2,3,4-tetrasubstituted isothiazol-5(2H)-imine hydrobromides from modified L-α-amino acids. Isothiazole rings are created in two-step reactions by oxidation of chiral 3-amino-2,3-unsaturated thioamides.