We present new approaches to the (C2) chiral and meso 1,4-diamino-2,3-butanediol (1) and 2,3-diamino-1,4-butanediol (2) and derivatives. Reactions of these compounds with aldehydes to form the novel 1,5-dioxa-3,7-diazadecalin (DODAD) and 1,5-diaza-3,7-dioxadecalin (DADOD) classes of compounds (7, 9, 11–15) are also reported. These reactions are diastereospecific, i.e., erythro (meso) or threostarting
Synthesis of New Chiral Mixed<i>cis</i>-Tetraheterodecalines by Highly Selective Cyclization of<i>N</i>,<i>N</i>′-Bisalkyl 2,3-Diaminobutanediols
作者:Jean-Louis Gras、Eric Taulier
DOI:10.1055/s-2006-926389
日期:——
Chiral secondary vic-diamines of diaminobutanediols have been efficiently prepared from l-tartaric acid. Their selective cyclization led to cis-tetraheterodecalines having a (1S,6S)-2,7-diaza-4,9-dioxa[4.4.0]decane core system.
Synthesis of chiral 2,3-disubstituted 1,4-diazabicyclo [2.2.2] octane. New ligand for the osmium-catalyzed asymmetric dihydroxylation of olefins
作者:Tohru Oishi、Masahiro Hirama
DOI:10.1016/s0040-4039(00)92331-1
日期:1992.1
Chiral 2,3-disubstituted 1,4-diazabicyclo[2.2.2]octane (DABCO) derivatives have been synthesized and utilized as a chiral ligand for the osmium-catalyzed asymmetricdihydroxylation of olefins. Optically active diols in up to 41%ee are obtained in good yields.
Abstract A facile method for the synthesis of (2R,3R)‐1,4‐dimethoxy‐1,1,4,4‐tetrasubstituted‐2,3‐butanediols involving oxidativecleavage of benzylidene acetal as a key step is described. These sterically hindered diols unusually formed cyclic sulfites as the majorproduct under methanesulfonylation reaction conditions.