Addition of a 3-alkoxy allenylzinc to N-acyliminium ions: new entry to propargyl syn-1,2-aminoalcohol units

Synthesis of novel polyhydroxylated pyrrolidine–triazole/-isoxazole hybrid molecules

A straightforward synthesis of novel, 2-heterocyclyl polyhydroxylated pyrrolidines is described.

High-yielding synthesis of sphingoid-type bases

An efficient methodology for the synthesis of sphingoid-type bases is reported. It involves the stereoselective addition of a racemic 3-alkoxy allenylzinc to enantiopure N-tert-butylsulfinyl imines and a cross-metathesis reaction as the key steps. It has been successfully applied to the syntheses of sphinganine and naturally occurring bioactive related compounds, among which the hydrolysis product of clavaminol H and two spisulosines. All of these compounds have been prepared in six steps from N-tert-butylsulfinyl imines in high overall yields (>56%).