Nitroaldol (Henry) reaction catalyzed by amberlyst A-21 as a far superior heterogeneous catalyst.
作者:Roberto Ballini、Giovanna Bosica、Paola Forconi
DOI:10.1016/0040-4020(95)00996-5
日期:1996.1
β-Nitroalcohols can be efficiently obtained with the help of AmberlystA-21, as heterogeneous basic catalyst, with or without solvent. This method is farsuperior to the heterogeneouscatalysts previously reported for the nitroaldol (Henry) reaction, in fact it gives higher yields with primary and secondary nitroalkanes, the formation of by-products such as nitroalkenes is avoited even if aromatic
β-Nitroalcohols can be readily obtained in high yields by the one-pot reaction of aldehydes with nitrecompounds in the presence of Et3N, Bu4NF·3H2O and tBuMe2SiCl. Model experiments indicated that trialkylsilyl nitronic esters are not reaction intermediates.
Improved Nitroaldol Reactions and Reductive Routes to Vicinal Aminoalcohols
作者:Ernest W. Colvin、Albert K. Beck、Dieter Seebach
DOI:10.1002/hlca.19810640732
日期:1981.11.4
Regioselective and flexible procedures are described for the preparation of a variety of protected vicinal nitroalcohols 1, 3 and 5 (see Scheme 5), as is an efficient method for their reduction to the corresponding vicinal aminoalcohols 2, 4 and 6.