Asymmetric Michael additions of Grignard reagents to cinnamamides deriving from N-alkyl (R)-(−)-2-aminobutan-1-ol
作者:Joe¨l Touet、Sylvie Baudouin、Eric Brown
DOI:10.1016/s0957-4166(00)82287-9
日期:1992.5
Reaction of cinnamoyl chloride with various N-alkyl derivatives of (R)-(−)-2-aminobutan-1-ol (a readily available reagent) afforded the corresponding cinnamamides. Michael additions of Grignardreagents to the latter, followed by acidic hydrolysis, yielded optically active β-phenylalkanoic acids whose ee most generally were in the range 72–100%.
Asymmetric syntheses and bio-evaluation of novel chiral esters derived from substituted tetrafluorobenzyl alcohol
作者:Shengzhen Xu、Huangyong Li、Xiaohui Wang、Changshui Chen、Minhui Cao、Xiufang Cao
DOI:10.1016/j.bmcl.2014.04.055
日期:2014.6
A series of novel chiral estersderivedfrom tetrafluorobenzyl alcohol were designed and prepared via asymmetric synthesis. The target molecules have been identified on the basis of analytical spectra data. All newly synthesized compounds have been screened their potential insecticidal activity against Plutella xylostella compared with those of fenvalerate and d-trans-phenothrin by standard method
通过不对称合成设计并制备了一系列衍生自四氟苄醇的新型手性酯。根据分析光谱数据确定了目标分子。已通过标准方法筛选了所有新合成的化合物对小菜蛾小菜蛾的潜在杀虫活性(与苯丙戊酸酯和d-反式-邻苯二酚相比),以及各对对映异构体(3 - B1 - R / S,3 - C1 - R / S,3 - D1 - R /S)表示明显不同的活动。
Rh-catalyzed Addition of β-Carbonyl Pinacol Alkylboronates to Aldehydes: Asymmetric Synthesis of γ-Butyrolactones
作者:Changwan Zhang、Jaesook Yun
DOI:10.1021/ol401468v
日期:2013.7.5
The rhodium-catalyzed 1,2-addition of chiral benzylic secondary alkylboronic esters with a coordinating carbonyl group to aldehydes was demonstrated with high levels of enantiospecificity. Pinacol boronic ester derivatives can be employed directly for the addition in the presence of KHF2 without the use of corresponding trifluoroborate salts where retention of the configuration was observed. Enantiomerically