Base-promoted selective β-fragmentation of homoallylamines
摘要:
A selective beta-fragmentation of homoallylamines with the combination of iodobenzene diacetate, iodine, and sodium acetate is reported. The desired carbon-carbon bond cleavage proceeded via a radical beta-scission pathway under mild conditions with good functional group tolerance. (C) 2010 Elsevier Ltd. All rights reserved.
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.
Imine allylation by allylic trimethylsilanes via in situ formation of N-tosyliminium species from carbonyl compounds and toluene-p-sulfonamide with SnCl2 and N-chlorosuccinimide: regioselection and diastereoselection
作者:Yoshiro Masuyama、Jiro Tosa、Yasuhiko Kurusu
DOI:10.1039/a902789k
日期:——
N-Tosyliminium species, prepared in situ from carbonyl compounds and TsNH2 with SnCl2 and N-chlorosuccinimide, undergo nucleophilic addition of allylic silanes (imine allylation) to produce the corresponding homoallylic amines; the imine allylation by but-2-enyltrimethylsilane with aldehydes and TsNH2 leads to regio- and diastereo-selection to produce anti 1-substituted 2-methylbut-3-enylamines.
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.
BiBr<sub>3</sub>‐Mediated Intramolecular Aza‐Prins Cyclization of Aza‐Achmatowicz Rearrangement Products: Asymmetric Total Synthesis of Suaveoline and Sarpagine Alkaloids
An intramolecular Prins cyclization of aza-Achmatowicz rearrangementproducts was developed to construct the versatile 9-azabicyclo[3.3.1]nonane (9-ABN) ring system with a variety of substitution patterns and then applied to the asymmetric total synthesis of six suaveoline and sarpagine alkaloids: macrophylline, suaveoline, norsuaveoline, affinisine, normacusine B and Na-Me-16-epipericyclivine.
开发了 aza-Achmatowicz 重排产物的分子内 Prins 环化,以构建具有多种取代模式的通用 9-氮杂双环[3.3.1]壬烷 (9-ABN) 环系统,然后应用于六种 Suaveoline 和沙帕津生物碱:大茶碱、甜甜碱、去苏甜碱、阿菲尼辛、正马库辛 B 和N a -Me-16-表哌环利文。
Palladium Pincer-Complex Catalyzed Allylation of Tosylimines by Potassium Trifluoro(allyl)borates
作者:Niclas Solin、Olov A. Wallner、Kálmán J. Szabó
DOI:10.1021/ol0475010
日期:2005.2.1
Palladium pincer complex 1 catalyzes the reaction of trifluoro(allyl)borate 2 with a wide range of tosylimines (3) under mild and neutral reaction conditions. This catalytic transformation affords homoallylic annines (4) in good to excellent yield. Mechanistic studies suggest that a transmetalation reaction between complex 1 and the borate salt 2 provides an eta(1)-allyipalladium complex, which subsequently reacts with the imine substrate.