Catalytic Asymmetric Access to α,β Unsaturated δ-Lactones through a Vinylogous Aldol Reaction: Application to the Total Synthesis of the Prelog-Djerassi Lactone
[reaction--see text] A one-step catalyticasymmetric access to alpha,beta unsaturated delta-lactones is described, using a vinylogous Mukaiyama-aldol reaction between a gamma-substituted dienolate and various aldehydes in the presence of Carreira catalyst CuF.(S)-tolBinap. This methodology has been further applied to a straightforward access to the Prelog-Djerassi lactone.
P(RNCH<sub>2</sub>CH<sub>2</sub>)<sub>3</sub>N-Catalyzed 1,2-Addition Reactions of Activated Allylic Synthons
作者:Philip B. Kisanga、John G. Verkade
DOI:10.1021/jo0106492
日期:2002.1.1
Activated allylic compounds of the type RCH:CHCH(2)Z (Z = CN, CO2Me) react efficiently with aromatic aldehydes in the presence of 20-40 mol % of P(R'NCH2CH2)(3)N at -94 to -63 degreesC. Both R = H and R = Me lead exclusively to a-addition products. When R = H and Z = CN, an allylic transposition occurs to afford a Baylis-Hillman product as the only product.
Brownbridge, Peter; Durman, John; Hunt, Paul G., Journal of the Chemical Society. Perkin transactions I, 1986, p. 1947 - 1958
作者:Brownbridge, Peter、Durman, John、Hunt, Paul G.、Warren, Stuart
DOI:——
日期:——
DURMAN, J.;WARREN, S., TETRAHEDRON LETT., 1985, 26, N 24, 2895-2898
作者:DURMAN, J.、WARREN, S.
DOI:——
日期:——
BROWNBRIDGE P.; DURMAN J.; HUNT P. G.; WARREN S., J. CHEM. SOC. PERKIN TRANS.,(1986) N 11, 1947-1958
作者:BROWNBRIDGE P.、 DURMAN J.、 HUNT P. G.、 WARREN S.