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2005
Cyclopentane derivatives
Q 0030
Tandem Alkylation—Cyclization Process via an O,C-Dianion. — Addition of
(II) to enamides (I) followed by treatment with freshly prepared solution of
31- 079 lithioallene
sBuLi generates an O,C-dianion which can be trapped by suitable electrophiles. It is
important to perform the subsequent cyclization step by addition of aq. HCl as rapidly
as possible to avoid diminished yields. The parameters that influence the geometry of
the exocyclic double bond of products are discussed. — (BANAAG, A. R.; BERGER,
G. O.; DHORO, F.; DE LOS SANTOS, D. B.; DIXON, D. D.; MITCHELL, J. P.;
TOKESHI, B. K.; TIUS*, M. A.; Tetrahedron 61 (2005) 13, 3419-3428; Dep. Chem.,
Univ. Hawaii, Honolulu, HI 96822, USA; Eng.) — Klein
2005
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