GIL, S.;SEOANE, E.;TORTAJADA, A., AN. QUIM. PUBL. REAL SOC. ESP. QUIM., 1985, 81, N 2, 93-96
作者:GIL, S.、SEOANE, E.、TORTAJADA, A.
DOI:——
日期:——
Highly Regio- and Stereoselective Allylation of α-Diketones via the Fluorosilicate Route
作者:Rainer Gewald、Mitsuo Kira、Hideki Sakurai
DOI:10.1055/s-1996-4151
日期:1996.1
Allylation of enolizable α-diketones with allyltrifluorosilanes in the presence of triethylamine gave the corresponding tertiary homoallyl alcohols in good yield in a highly regio- and stereospecific manner. The reaction proceeds as diallylation with allyltrifluorosilanes yielding the 1,2-diols with high diastereoselectivity. The more sterically demanding crotyl- and prenyltrifluorosilanes lead exclusively to monoallylated products with the allyl group being added γ-regioselectively. In addition, highly diastereoselective crotylation was observed in the formation of the monoallylated α-hydroxy ketones. Asymmetric α-diketones were generally allylated at the less enolized ketone group except when both diketone and allylsilane were sterically hindered.