Highly Diastereoselective Aldol Reaction of Bicyclo[3.2.1]oct-6-en-3-ones and 8-Oxabicyclo[3.2.1]oct-6-en-3-ones. (E)-Selective conversion into ?-alkylidene ketones
作者:Ingo Stohrer、H. Martin R. Hoffmann
DOI:10.1002/hlca.19930760604
日期:1993.9.22
base-mediated elimination with lithiumdiisopropylamide/N,N,N′,N′-tetramethylethylenediamine (LDA/TMEDA; Scheme 2). The simple α-methylidene ketones 17a and 18a were obtained via oxidation of the phenylselenides 19 and 20, respectively (Scheme 4). The tertiary aldol 27 was synthesized best by treatment of 1,3-diketone 26 with Me4Zr (Table 4). In this fashion, the facile retro-aldol reaction of 27 was