Functionalized chloroenamines in aminocyclopropane synthesis - X. amino-azabicyclo[3.1.0]hexane diastereomers from chloroenamines and - organometallic compounds
作者:Volker Butz、Elmar Vilsmaier
DOI:10.1016/s0040-4020(01)87188-x
日期:1993.7
Morpholino-chlorotetrahydro-N-methyl-pyridine 4 reacted with Grignard reagents 5 or diorganyl-magnesium compounds 6 to give a mixture of azabicyclo[3.1.0]hexane diastereomers 10 and 11 besides the monocyclic ketones 12. The latter were obtained as the sole products from chloroenamine 4 and dimethylzinc 7a or lithium dimethylcopper 8a. Organolithium compounds 9a,c or Grignard reagents 5a-c in the presence of TMEDA transferred 4 exclusively to endo-morpholino isomers 10. exo-Amines 11 could be obtained with high stereoselectivity from 4 via the N,O-acetal 13 and by the substitution of the methoxy moiety by a Grignard reagent 5. The stereochemical result of this substitution reaction can be explained by an intermediate complexation of the pyrrolidine N-atom in 13 by the Grignard reagent 5. An N-benzyl chloroenamine 14 instead of the N-methyl compound 4 showed a different reaction behavior with methylmagnesium bromide 5a leading only to endo-amine 15 which could be used as a precursor of the parent bicyclic system 16. The configurations of the bicyclic diamines 10, 11 and 15 were determined via H-1 NMR data.
作者:Vilsmaier, Elmar、Klein, Claus Michael、Troeger, Wolfgang
DOI:——
日期:——
Mechanism of the reaction of hexachloroacetone with enamines. A new, convenient synthesis of .alpha.-chloro ketones, .beta.-chloro enamines, and allylic chloro enamines
作者:F. M. Laskovics、E. M. Schulman
DOI:10.1021/ja00462a033
日期:1977.9
VILSMAIER E.; TROEGER W.; SPRUEGEL W.; GAGEL K., CHEM. BER., 1979, 112, NO 8, 2997-3006
作者:VILSMAIER E.、 TROEGER W.、 SPRUEGEL W.、 GAGEL K.