Novel heterocyclic selenazadiphospholaminediselenides, zwitterionic carbamidoyl(phenyl)-phosphinodiselenoic acids and selenoureas derived from cyanamides
作者:Guoxiong Hua、Qingzhi Zhang、Yang Li、Alexandra M.Z. Slawin、J. Derek Woollins
DOI:10.1016/j.tet.2009.05.056
日期:2009.8
2,4-Bis(phenyl)-1,3-diselenadiphosphetane-2,4-diselenide (Woollins' reagent, WR) reacts with cyanamides (1a-h) in refluxing toluene to afford a series of novel selenazadiphospholaminediselenides (RR'NC=N(PhP(Se)SeP(Se)Ph, R=C6H5(CH2)(1-3), 4-n-C10H21C6H4 and 4-BrC6H4CH2; R'=H, CH3, C2H5 and C(O)OC2H5 2a-g). Post-treatment of the reaction mixture with water led to the formation of carbamidoyl(phenyl)phosphinodiselenoic acids (RR'NC(NH2)P(SeH)(2)Ph, R=C6H5(CH2)(2-3), 4-n-C10H21C6H4 and 4-BrC6H4CH2; R'=H and CH3, 3b, 3c, 3e and 3f) and selenoureas (RR'NC(Se)NH2, R=C6H5(CH)(1-2); R'=CH3 and OC(O)C2H5, 4f and 4h) in moderate to excellent yields. All new compounds are characterised spectroscopically and five X-ray crystal structures are reported. (C) 2009 Elsevier Ltd. All rights reserved.