Synthesis of c-di-GMP Analogs with Thiourea, Urea, Carbodiimide, and Guanidinium Linkages
                                
                                    
                                        作者:Barbara L. Gaffney、Roger A. Jones                                    
                                    
                                        DOI:10.1021/ol403154w
                                    
                                    
                                        日期:2014.1.3
                                    
                                    The first syntheses of neutral thiourea, urea, and carbodiimide analogs, along with two guanidinium analogs, of the bacterial signaling molecule cyclic diguanosine monophosphate (c-di-GMP) are reported. The key intermediate, obtained in nine steps, is a 3'-amino-5'-azido-3',5'-dideoxy derivative. The S'-azide serves as a masked amine from which the amine is obtained by Staudinger reduction, while the 3'-amine is converted to an isothiocyanate that, while stable to chromatography, and Staudinger conditions, nevertheless reacts well with the 5'-amine.