BIS(HYDROXYALKYLATED) DERIVATIVES OF PARABANIC ACID
作者:Iwona Zarzyka-Niemiec,、Jacek Lubczak、Zbigniew Ciunik、Stanislaw Wołowiec、Tomasz Ruman
DOI:10.1515/hc.2002.8.6.559
日期:2002.1
at preliminary stage of polyaddition reaction between parabanicacid and epoxides leading to parabanate-bonded polyethers. N-hydroxyalkylated derivatives of heteroaromatics like isocyanuric acid (X = N-H, Y = H) and parabanicacid (PBH2, X = none, Y = H): can be obtained by straight hydroxymethylation of free acids with formaldehyde or oxiranes, or by synthesis of s-triazene (or imidazolidine) ring
asymmetric transfer hydroxymethylation of activated isoindolinones, allowing us to prepare the enantioenriched hydroxymethylated adducts in good to excellent yields (48–96%) and enantiopurities (81:19–97:3 e.r.). To increase the reaction rate without compromising the selectivity, carefully optimized formaldehyde surrogates were employed, providing a convenient source of anhydrous formaldehyde with a base-triggered