A facile and expeditious entry to acyclic carbohydrate-derived 1,2-diazabutadienes
摘要:
Chiral 1,2-diaza-1,3-butadienes derived from acyclic monosaccharides are easily prepared from the corresponding and readily available unprotected sugars in a two-step sequence.
The synthesis of several 1,2-diaza-1,3-butadienes 1 derived from carbohydrates is described. The reaction of 1, as chiral dienophiles, with 1,4-benzoquinone, 1,4-napthoquinone, and diethyl azodicarboxylate ocurs with high ν-facial stereoselectivity.