C. Bolm et al., Simple synthesis of enantiomerically pure C-2-symmetric bisoxazolidines from amino alcohols and formaldehyde, SYN COMMUN, 29(1), 1999, pp. 43-51
Treatment of chiral amino alcohols 1 with an excess of formaldehyde followe
d by reaction with NaOH at room temperature provides optically active C-2-s
ymmetric N,N'-methylenebisoxazolidines 2 in high yield.