An Efficient Method for the Synthesis of Nitropiperidones
摘要:
[GRAPHICS]A three step efficient strategy for the synthesis of substituted 5-nitropiperidones in high de, employing Michael addition of N-p-tolylsulfinyl beta-nitroamines to alpha, beta-unsaturated esters, hydrolysis of the sulfinyl group, and cyclization of the resulting free amines, has been developed. A very simple experimental procedure involving mild conditions and only one chromatographic purification are the main features of the process.
An Efficient Method for the Synthesis of Nitropiperidones
摘要:
[GRAPHICS]A three step efficient strategy for the synthesis of substituted 5-nitropiperidones in high de, employing Michael addition of N-p-tolylsulfinyl beta-nitroamines to alpha, beta-unsaturated esters, hydrolysis of the sulfinyl group, and cyclization of the resulting free amines, has been developed. A very simple experimental procedure involving mild conditions and only one chromatographic purification are the main features of the process.
Asymmetric Aza-Henry Reactions from <i>N</i>-<i>p</i>-Tolylsulfinylimines
作者:José Luis García Ruano、Markus Topp、Jesús López-Cantarero、José Alemán、Modesto J. Remuiñán、M. Belén Cid
DOI:10.1021/ol051580d
日期:2005.9.1
[reaction: see text] N-Sulfinylimines derived from aromatic or aliphatic aldehydes and ketones react with nitromethane and NaOH in a highly diastereoselective manner under mild conditions. In the presence of TBAF, the reaction rates are strongly increased and the stereoselectivity is inverted. This method provides enantiomerically pure beta-nitroamines derived from enolizable aldimines and ketimines