摘要:
Bicyclic endo-amines 6a,b could be prepared in a stereospecific way from the reaction of chloroenamines 1a,b and sodium borohydride and by deboranation of the primarily formed borane adducts 8. An X-ray structure analysis is given for 8a. In contrast to 1a,b, chloroenamine 1c and sodium borohydride preferentially produced an exo-amine 7c besides the endo-amine 6c (3:1). Subsequent LiAlH4-reduction of 7c allowed the synthesis of 7a - the diastereoisomer of 6a. Interaction of sodium borohydride with dichloroenamine 2a provided diamine 12 instead of an expected bicyclic exo-amine 10.