Efficient Nitro-Aldol Reaction Using SmI<sub>2</sub>: A New Route to Nitro Alcohols under Very Mild Conditions
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Concellón
DOI:10.1021/jo061465w
日期:2006.9.1
A novel method to obtain racemic 1-nitroalkan-2-ols by reaction of bromonitromethane with a variety of aldehydes and promoted by SmI2 is reported. On the basis of these results, the chiral version has also been performed with chiral N,N-dibenzyl amino aldehydes, affording the corresponding enantiopure 3-amino-1-nitroalkan-2-ols with good stereoselectivity.
A versatile and efficient approach for the synthesis of chiral 1,3-nitroamines and 1,3-diamines via conjugate addition to new (<i>S</i>,<i>E</i>)-γ-aminated nitroalkenes derived from L-α-amino acids
作者:Vera Lúcia Patrocinio Pereira、André Luiz da Silva Moura、Daniel Pais Pires Vieira、Leandro Lara de Carvalho、Eliz Regina Bueno Torres、Jeronimo da Silva Costa
DOI:10.3762/bjoc.9.95
日期:——
New chiral (S,E)-gamma-N,N-dibenzylated nitroalkenes 2a-c were synthesized from natural L-(alpha)-amino acids in five steps with overall yields of 68-88%. The conjugate addition of hydride, methoxide, nitronate and azide nucleophiles to 2a-c led to the corresponding chiral 1,3-nitroamines in 74-90% yield. The conjugate addition of cyanide anion to 2a,b was followed by HNO2 elimination affording chiral
Generation of functional diversity via nitroaldol condensations of α-aminoacid aldehydes — A new and stereocontrolled route to acyclic 1,3-diamino-2-alcohols
作者:Stephen Hanessian、Pratik V. Devasthale
DOI:10.1016/0040-4039(95)02359-3
日期:1996.2
Condensations of N,N-dibenzyl α-amino aldehydes with nitroalkanes mediated by tetrabutylammonium fluoride proceed in excellent yields and selectivites. This affords rapid and stereoselective access to acyclic molecules containing differentiated nitrogen-containing functionality as well as diverse end groups.
Diastereoselective Henry reactions of N,N-dibenzyl α-amino aldehydes with nitromethane catalyzed by enantiopure guanidines
作者:Dawei Ma、Qiangbiao Pan、Fushe Han
DOI:10.1016/s0040-4039(02)02332-8
日期:2002.12
Several enantiopure guanidines are studied as the catalysts of Henry reactions of N,N-dibenzyl alpha-amino aldehydes with nitromethane. Good diastereoselectivity is observed in the reactions of L-valine or L-isoleucine derived aldehydes catalyzed by a (R)-1-(1-naphthyl)ethylamine derived guanidine. (C) 2002 Elsevier Science Ltd. All rights reserved.
Activation of nitroaldol reactions by diethylzinc and amino alcohols or diamines as promoters
Henry reactions of nitroalkanes call be initiated with diethylzine in the presence of catalytic amounts of 1,2aminoethanol or 1,2-diaminoethane. (C) 2002 Elsevier Science Ltd. All rights reserved.