Design and synthesis of chiral and racemic phosphonate-based haptens for the induction of aldolase catalytic antibodies
作者:YongQi Mu、Richard A Gibbs
DOI:10.1016/s0968-0896(97)00088-6
日期:1997.7
alternative phosphonatehapten 39 was prepared. The key step in the synthesis of 39 was the direct generation of an unprotected phosphonate precursor via coupling of the secondary alcohol 37 with CH3P(O)Cl2. The chiral counterpart of hapten 39 was also synthesized from alcohol 46, prepared by Corey's asymmetric reduction method. One polyclonal antibody preparation generated from 39 appeared to catalyze the
Enantioselective Synthesis of 2,6-<i>cis</i>-Disubstituted Tetrahydropyrans via a Tandem Catalytic Asymmetric Hydrogenation/Oxa-Michael Cyclization: An Efficient Approach to (−)-Centrolobine
A highly efficient one-pot process via a tandemreaction of catalytic asymmetric hydrogenation and oxa-Michael cyclization for the synthesis of 2,6-cis-disubstituted tetrahydropyrans has been developed (ee up to 99.9%, cis/trans-selectivity up to 99:1). This method provides a concise route to (−)-centrolobine (68.8% yield, three steps).
New methods for the synthesis of naphthyl amines; application to the synthesis of dihydrosanguinarine, sanguinarine, oxysanguinarine and (±)-maclekarpines B and C
作者:Matthew R. Tatton、Iain Simpson、Timothy J. Donohoe
DOI:10.1039/c4cc05209a
日期:——
A new method for preparing naphthyl amines from 1,5 unsaturated dicarbonyl precursors is described; the utility of this new method was proven in the syntheses of several natural products, all containing the benzo[c]phenanthridine core and enabled by a radical promoted cyclisation of the naphthyl amine products formed in the key cyclisation.