Phosphazene base-catalyzed hydroamination of aminoalkenes for the construction of isoindoline scaffolds: Application to the total synthesis of aristocularine
A method for isoindoline synthesis via phosphazene base-catalyzed intramolecular hydroamination of aminoalkenes was developed. The reaction has a broad functional group tolerance, including for halide, cyano, and methoxy groups, and could also be used to synthesize tetrahydroisoquinoline, pyrrolidine, and piperidine. The method was used as a key step in the total synthesis of aristocularine in six
建立了磷腈碱催化氨基烯烃分子内加氢胺化合成异二氢吲哚的方法。该反应具有广泛的官能团耐受性,包括卤化物、氰基和甲氧基,也可用于合成四氢异喹啉、吡咯烷和哌啶。该方法被用作马兜铃碱全合成的关键步骤,分六步进行,总产率为 35%。该策略涉及通过控制所需 C N 键的形成来构建异二氢吲哚核心,而相对不稳定的甲氧基甲基和芳基溴保持完整。
A novel route to unsymmetrical stilbene derivatives via intramolecular free radical ipso substitution reactions
作者:Christopher R.A. Godfrey、Philip Hegarty、William B. Motherwell、Muhammed K. Uddin
DOI:10.1016/s0040-4039(97)10645-1
日期:1998.2
Unsymmetrical stilbene derivatives can be prepared via intramolecular free radical ipso substitution reactions using suitably constituted vinyl sulfonate and sulfonamide tethering chains.
Diastereoselective and Enantioselective Substitution Reactions of an Isoindoline-Borane Complex
作者:Alexander J. Blake、Mark R. Ebden、David N. A. Fox、Wan-Sheung Li、Nigel S. Simpkins
DOI:10.1055/s-1998-1611
日期:1998.2
The alkylation of N-methylisoindoline-borane complex is diastereoselective, the substitution occurring predominantly syn to the borane group. Use of the SBuLi-sparteine reagent mixture enables the reaction to be conducted enantioselectively, giving the chiral isoindoline-borane complexes in up to 89% ee. Both the relative and absolute configurations of the alkylation products were established by X-ray structure determinations.
N-甲基异吲哚啉-硼烷络合物的烷基化是非对映选择性的,取代主要发生在硼烷基团的顺式上。使用 SBuLi-金雀花试剂混合物使得反应能够对映选择性地进行,得到手性异吲哚啉-硼烷络合物,其 ee 高达 89%。烷基化产物的相对构型和绝对构型均通过X射线结构测定确定。
Catalytic asymmetric intramolecular hydroamination of aminoalkenes
Asymmetric intramolecular cyclization of aminoalkenes was catalyzed by a catalytic amount of n-butyllithium, diisopropylamine, and a newly designed chiral bisoxazoline in toluene to produce kinetically controlled exo-cyclized amines with up to 91% ee quantitatively. (c) 2007 Elsevier Ltd. All rights reserved.
Sugasawa; Shigehara, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1943, vol. 63, p. 98,101