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。
Organometallic Reactions in Aqueous Media. Indium- and Zinc-Mediated Allylation of Sulfonimines<sup>1</sup>
作者:Wenshuo Lu、Tak Hang Chan
DOI:10.1021/jo0009898
日期:2000.12.1
effectively allylated to the corresponding homoallylic sulfonamides with allylic bromides promoted by indium or zinc. The solvent used can be water, THF, or a mixed aqueous THF solvent. The regioselectivity and stereoselectivity of the reaction were studied.
Allylation and highly diastereoselective syn or anti crotylation of N-toluenesulfonylimines using potassium allyl- and crotyltrifluoroborates
作者:Sze-Wan Li、Robert A. Batey
DOI:10.1039/b403759f
日期:——
Air and moisture stable potassium allyl- and crotyltrifluoroborates undergo addition to N-sulfonyl and N-sulfinyl aldimines in the presence of Lewis acids, to provide the corresponding homoallylic amines in high yields and excellent diastereoselectivity.
Allylic trichlorotins, prepared in situ from α,α-diisopropylhomoallylic alcohols with tin(II) chloride and N-chlorosuccinimide in dichloromethane at -40 °C, cause nucleophilic addition to N-tosylimines or N-tosyliminiums to afford the corresponding α-substituted homoallylic amines.
烯丙基三氯锡,由 α,α-二异丙基高烯丙醇与氯化锡 (II) 和 N-氯代琥珀酰亚胺在 -40 °C 的二氯甲烷中原位制备,导致对 N-甲苯磺酰亚胺或 N-甲苯磺酰亚胺的亲核加成得到相应的 α-取代的高烯丙基胺类。