Monatshefte fur Chemie p. 1247 - 1254 (1997)
Update date:2022-08-04
Topics:
Kaiser
Bielmeier
Wiegrebe
Highly diastereoselective BH3/THF syn-reduction of the 3-hydroxy-1,3-diphenylpropan-1-one/BBr3 complex 3/BBr3 (cf. Sarko) afforded the meso-diol 4, whereas racemate 5 was obtained by BH3/THF reduction without complexation. Mesylation, exchange of mesylate by azide, and reduction with SnCl2/thiophenol led to the diamines 10 and 11 which were also produced by reductive N-N cleavage of the 4,5-dihydropyrazole 13.
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