Domino Mukaiyama–Michael reactions in the synthesis of polycyclic systems
作者:Florence C.E. Sarabèr、Svetlana Dratch、Geke Bosselaar、Ben J.M. Jansen、Aede de Groot
DOI:10.1016/j.tet.2005.11.059
日期:2006.2
Good results were obtained in the Mukaiyama-Michael reaction of the silyl enol ether of cyclohexanone with 2-methyl-2cyclopentenone and carvone, with transfer of the silyl group to the receiving enone and with TrSbCl6 as catalyst. A second Mukaiyama-Michael reaction of this new silyl enol ether with methyl vinyl ketone and cyclization of the resulting adduct leads to tricyclic compounds in one-pot domino sequences. The scope and limitations of this domino reaction have been investigated. (c) 2005 Elsevier Ltd. All rights reserved.
A new approach toward the synthesis of C,D-cis coupled steroid and C,D-cis coupled d-homosteroid skeletons
作者:Svetlana Dratch、Tanya Charnikhova、Florence C.E Sarabèr、Ben J.M Jansen、Aede de Groot
DOI:10.1016/s0040-4020(03)00629-x
日期:2003.6
procedure has been developed for the synthesis of C,D-cis coupled steroid and d-homo steroid skeletons. A Mukaiyama reaction with transfer of the silyl group of the starting silylenolether to the enol of the adduct followed by addition of vinyl magnesium bromide to the unprotected carbonyl group leads to adducts which can be cyclized with ZnBr2. The synthesis of functionalized steroid skeletons in overall