The traditional McFadyen–Stevensreaction requires harsh alkaline reaction conditions, thus precluding application to the synthesis of aliphatic aldehydes. Our modified McFadyen–Stevensreaction enables the transformation from the N,N-acylsulfonyl hydrazine to the corresponding aldehyde upon treatment with an imidazole–TMS imidazole combination without relying on oxidative or reductive reagents. The
Lischewski, Manfred, Zeitschrift für Chemie, 1984, vol. 24, # 2, p. 64 - 65
作者:Lischewski, Manfred
DOI:——
日期:——
Lischewski, Manfred, Zeitschrift für Chemie, 1982, vol. 22, # 8, p. 311 - 312
作者:Lischewski, Manfred
DOI:——
日期:——
Gibberelline—lxii
作者:M. Lischewski、G. Adam
DOI:10.1016/0040-4020(80)87025-6
日期:1980.1
reported. From four different methods studied for the synthesis of GA3-7-alcohols the direct NaBH4-reduction of the anhydrides5a and5b has been found to be optimal leading in good yields to 3 and 9, respectively. Oxidation of 3 with the N - chlorosuccinimide - dimethylsulfide complex or pyridinium chlorochromate followed by deacetylation afforded the GA3-7-aldehyde 16.—The partialsynthesis of 6β-methyl-7-nor-GA3
2 is silylated, enolised with KH and converted by the addition of acid to a mixture of epimeric aldehydes 2 and 3. Subsequent acetylation, oxydation and deacetylation of 3 affords 6-Epi-gibberellin-A3 (6).