A General Method for the Preparation of <i>N</i>-Sulfonyl Aldimines and Ketimines
作者:José Luis García Ruano、José Alemán、M. Belén Cid、Alejandro Parra
DOI:10.1021/ol048005e
日期:2005.1.1
[Reaction: see text] A simple procedure to obtain N-sulfonylimines involving the condensation of carbonyl compounds with p-tolyl or tert-butyl sulfinamides followed by oxidation with m-CPBA of the resulting N-sulfinylimines is reported. The method is applicable to aldehydes (aliphatics and aromatics) and ketones (diaryl, dialkyl, and aryl alkyl), even those containing enolizable protons. It also does
A method for the synthesis of amide‐containing molecules was developed using vinylazides as an enamine‐type nucleophile towards carbon electrophiles, such as imines, aldehydes, and carbocations that were generated from alcohols in the presence of BF3⋅OEt2. After nucleophilic attack of the vinylazide, a substituent of the resulting iminodiazonium ion intermediate migrates to form a nitrilium ion,
Lewis base-catalyzed perfluoroalkylation of carbonyl compounds and aldimines with (perfluoroalkyl)trimethylsilanes (TMSCF3, TMSC2F5, and TMSC3F7) is described. The nitrogen- or oxygen-containing an...
first catalytic addition reactions of sulfonylimidates have been accomplished. In the presence of a catalytic amount of DBU (normally 5−10 mol %), sulfonylimidates reacted with several N-protected imines, methyl acrylate, and azodicarboxylate to afford the corresponding addition adducts, sulfonylimidates, in excellent yields. In the addition reactions to imines, high anti-selectivity was observed. A
磺酰亚胺酯的第一次催化加成反应已经完成。在催化量的 DBU(通常为 5-10 mol%)存在下,磺酰亚胺酯与几种 N 保护的亚胺、丙烯酸甲酯和偶氮二羧酸酯反应,以极好的收率提供相应的加合物磺酰亚胺酯。在与亚胺的加成反应中,观察到高抗选择性。还描述了从醛和磺酰亚胺酸酯直接形成 β-氨基酸衍生物的新方法。
New Approaches to Polysubstituted Pyrroles and γ-Lactams Based on Nucleophilic Addition of Ti(IV) Enolates Derived from α-Diazo-β-keto Carbonyl Compounds to <i>N</i>-Tosylimines
作者:Changqing Dong、Guisheng Deng、Jianbo Wang
DOI:10.1021/jo0605039
日期:2006.7.1
The Ti(IV) enolates derivedfrom α-diazo-β-keto esters or ketones efficiently add to TiCl4-activated N-tosylimines to give δ-N-tosylamino substituted α-diazo-β-keto carbonyl compounds. The diazo decomposition of the addition products occurs under Rh2(OAc)4-catalyzed or photoinduced conditions to afford pyrrole or γ-lactam derivatives, both in high yields.