Synthesis of 2 or 3-(hetero)aryl pyrazolo[1,5-a]pyridines through [3 + 2] cycloaddition ofN-aminopyridine with β-nitrostyrenes followed byin situdenitration under metal-free and mild conditions are described.
Asymmetric Michael Additions of a Chiral Phosphite to Nitroalkenes and Knoevenagel Acceptors
作者:Dieter Enders、Livio Tedeschi、Dominik Förster
DOI:10.1055/s-2006-926437
日期:2006.5
The diastereoselective Michael addition of an enantiopure phosphite to nitroalkenes and α,β-unsaturated malonates is described. High asymmetric inductions were obtained using a readily available TADDOL auxiliary. Racemization-free cleavage of the auxiliary led to α-substituted β-nitro phosphonates and β-substituted β-phosphono malonates in good yields and high enantiomeric excesses, respectively. An