Activation of Fmoc-Protected <i>N</i>,<i>O</i>-Acetals Using Trimethylsilyl Halides: Mechanistic and Synthetic Studies
作者:Nicholas C. Boaz、Nathaniel C. Bair、Thanh T. Le、Timothy J. Peelen
DOI:10.1021/ol100494z
日期:2010.6.4
O-acetals yields reactive intermediates capable of efficiently adding to a variety of enamines. NMR studies have provided evidence that a stable halomethyl carbamate intermediate forms in solution. Good yields are obtained over a broad range of enaminenucleophiles encompassing both cyclic and acyclic ketone-derived and aldehyde-derived enamines. Preliminary studies suggest that the enamine additions occur
Fmoc保护的N,O-缩醛的三甲基甲硅烷基卤化物活化产生能够有效地添加到多种烯胺中的反应性中间体。NMR研究提供了证据,表明在溶液中形成了稳定的氨基甲酸卤甲基酯中间体。在宽范围的烯胺亲核试剂上都获得了良好的收率,包括环和非环状的酮衍生和醛衍生的烯胺。初步研究表明,烯胺的添加是通过协调一致的S N 2型机制发生的。
Reaction of 5-Arylidenerhodamine Derivatives with 1-Piperidinocyclohexene and Diethylaminoheptene Enamines
作者:Mahmoud A. Abdel-Rahman
DOI:10.1135/cccc19933009
日期:——
The present paper deals with the reaction of arylidenerhodamine derivatives Ia - Id with enamines 1-piperidinocyclohexane IIa and diethylaminoheptene IIb, stronger nucleophiles than 1-morpholinocyclohexane described earlier.
Tiollais,R. et al., Bulletin de la Societe Chimique de France, 1964, p. 1205 - 1206
作者:Tiollais,R. et al.
DOI:——
日期:——
Structure of Monocrotaline. VII.<sup>1</sup> Structure of Retronecine and Related Bases
作者:Roger Adams、Marvin Carmack、J. E. Mahan
DOI:10.1021/ja01263a020
日期:1942.11
Rhodium complex encapsulated functionalized hexagonal mesoporous silica for heterogeneous hydroaminomethylation
作者:N. Sudheesh、Ram S. Shukla
DOI:10.1016/j.apcata.2012.12.021
日期:2013.2
HRh(CO)(PPh3)(3) complex was encapsulated into the pores of amino functionalized hexagonal mesoporous silica. The catalyst was characterized by physico-chemical techniques like P-XRD, P-31-CPMAS NMR, FT-IR, SEM, ICP and N-2 adsorption analysis. The catalyst was active for hydroaminomethylation and a variety of alkenes and amines were used as reactants for hydroaminomethylation. The catalyst afforded to achieve 100% conversion with high (>95%) selectivity to corresponding amines. Parametric variations were performed by taking 1-hexene and morpholine as representative reactants for the study of catalyst amount, temperature, pressure and 1-hexene:morpholine ratio. Significant amounts of aldehydes and enamines were observed during the course of the reaction indicating that there could be two possible rate determining steps. The catalyst was effectively recycled up to five times without much loss in its activity and selectivity. (C) 2012 Elsevier B.V. All rights reserved.