A transition metal-free facile access to β-amino alcohols via epoxide ring-opening with amine nucleophiles. The process is carried out at room temperature with only 0.5 mol % catalyst loading. A wide spectrum of styrene oxide and aniline derivatives are readily tolerated by this procedure. A highly effective gram-scale synthesis with a high TON=842 is also reported.
N-acyl pyrazoles were efficiently and selectively prepared through the 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD)-catalyzed reaction of nitrosoarenes with N-acyl pyrazoles via an N-nitroso aldol reaction/dehydration sequence. The α-imino acyl pyrazoles were demonstrated to be new versatile intermediates for practical one-pot syntheses of α-imino amides, dipeptide precursors, esters, and β-amino alcohols