Miscellaneous reactions reaction with imines

MISCELLANEOUS REACTIONS OF DIHYDROPYRIDINES Additional tests for net hydride transfers initiated by single-electron transfer include the use of substrates in which such pathways would necessarily involve readily ring-opened cyclopropylmethyl or readily cyclized 5-hexenyl radicals. Products from these radical reactions are not formed in NAD+/ NADH dependent enzymic reductions or oxidations (Maclnnes et al., 1982, 1983 Laurie et al., 1986 Chung and Park, 1982). Such tests have also been applied in non-enzymic reductions. Thus cyclopropane rings in cyclopropyl 2-pyridyl ketones, or imines of formylcyclopropane (van Niel and Pandit, 1983, 1985 Meijer et al., 1984) survive Mg+2 catalysed reduction by BNAH or Hantzsch esters but are opened by treatment with tributylin hydride. 

Miscellaneous reactions. The starting point of a practical route to P -amino acids is the proline-catalyzed Mannich reaction of aldehydes with a chiral iminium salt derived from A-benzyl-A-(a-phenethyl)amine. Condensation of aldehydes with A-Boc imines furnishes mainly i yn-adducts. "... 

D. Miscellaneous.—Low yields of the spirophosphoranes (34) were obtained on heating the phosphorane (32) with the aziridines (33). Stable phosphoranes have been obtained from phenanthraquinone mono-imine (35) and trialkyl phosphites, and from 2-chlorotropone (36) and ylides. In the latter reaction cyanomethylenetriphenylphosphorane gave instead the betaine (37). 

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