Photoreductive Coupling of Aldimines. Synthesis of C2 Symmetrical Diamines
摘要:
The photoreductive coupling of pyridine-, arene- and alkynecarboxaldimines is a very convenient procedure for the preparation of vicinal diamines in good to excellent yields. The usual trend gave an excess of meso diamine, which enhances the usefulness of this method. The procedure tolerates bulky groups such as tert-butyl and diphenylmethyl on the nitrogen atom. (C) 2000 Elsevier Science Ltd. All rights reserved.
Facile Double NucleophilicAddition of Thiols and Tetraallyltin to Latent 2-AlkynalsUsing in situ Hydrolysis of the Imino Functionality Promoted by Tin(IV)Chloride Pentahydrate
作者:Makoto Shimizu、Takafumi Nishi、Akihiro Yamamoto
DOI:10.1055/s-2003-40857
日期:——
In the presence of SnCl4Ë5H2O, a mixture of thiols and tetraallyltin underwent 1,4- and 1,2-addition, respectively, with the imines derived from 3-alkynals to give (Z)-1-sulfenyl-1,5-alkadien-3-ols in good yields, where the hydrolysis of the intermediary imino species was found to be crucial.