描述了烷基,芳基和杂环亚胺与M盐之间的曼尼希型反应,用于通过使用纳米晶状氧化镁(NAP-MgO)合成α-硫烷基-β-氨基酸衍生物。这些产品以中等至高收率获得,具有适度的非对映选择性。X射线衍射技术已证实3-{[[(4-甲基苯基)磺酰基]氨基} -2-(甲基硫烷基)-3-(4-硝基苯基)丙酸乙酯(主要异构体)的构型是抗,并与基于1 H NMR光谱的赋值一致。这些α-硫烷基-β-氨基酸衍生物是具有强生物活性的药物的重要组成部分。
A novel and efficient method for the generation of o-quinone methide intermediates was developed from the readily available 2-tosylalkylphenols under the mildbasicconditions, and their reactions with sulfur ylides were investigated for the stereoselective synthesis of trans-2,3-dihydrobenzofurans.
1‐Aminocyclopropanecarboxylic acidderivatives are synthesized from readily available dehydroaminoacidderivativesvia sulfur ylide. A range of different ylides are employed and the corresponding aminocyclopropanes are afforded with reasonable diastereoselection in good yields.
Tandem Spirocyclopropanation/Rearrangement Reaction of Vinyl <i>p</i>-Quinone Methides with Sulfonium Salts: Synthesis of Spirocyclopentenyl <i>p</i>-Dienones
作者:Xiang-Zhi Zhang、Yu-Hua Deng、Kang-Ji Gan、Xu Yan、Ke-Yin Yu、Fang-Xin Wang、Chun-An Fan
DOI:10.1021/acs.orglett.7b00516
日期:2017.4.7
A novel base-mediated tandem spirocyclopropanation/rearrangement reaction of vinyl p-quinone methides (p-VQMs) with sulfonium salts is described. The unprecedented reactivity of p-VQMs was explored for the first time in the spiroannulation cascade, providing a stereoselective approach to the construction of synthetically interesting, densely functionalized spirocyclopentenyl p-dienones.
The aziridination of N-tosylimines with amide-stabilized sulfonium ylides: A simple and efficient preparation of aziridinyl carboxamides
作者:Yong-Gui Zhou、An-Hu Li、Xue-Long Hou、Li-Xin Dai
DOI:10.1016/s0040-4039(97)01736-x
日期:1997.10
Reaction of N-sulfonylimines 2 with N,N-dialkylcarbamoylmethyl dimethylsulfonium bromides 3 in the presence of solid KOH gives the aziridinyl carboxamides 4 in good to excellent yields.
A concise synthesis of spiro-cyclopropane compounds from indole derivatives and sulfur ylides has been developed via a dearomatization strategy. Moreover, the spiro-cyclopropane compounds could be conveniently transformed to rearomatized indole derivatives in the presence of acids.