Highly Enantioselective Aza Morita−Baylis−Hillman Reaction Catalyzed by Bifunctional β-Isocupreidine Derivatives
作者:Nacim Abermil、Géraldine Masson、Jieping Zhu
DOI:10.1021/ja805122j
日期:2008.9.24
The aza-MBH reaction of imines 1 and beta-naphthyl acrylate 2 in the presence of C-6' modified beta-isocupreidine derivative 1c (0.1 equiv) and beta-naphthol 5 (0.1 equiv) afforded the corresponding (3S)-aza-MBH adducts 4 in high yield and excellent enantiomeric excess. These catalytic conditions allowed the aliphatic imines to be employed for the first time as electrophilic partners of the aza-MBH
在C-6'修饰的β-异铜吡啶衍生物1c(0.1当量)和β-萘酚5(0.1当量)存在下,亚胺1和β-萘基丙烯酸酯2的氮杂-MBH反应得到相应的(3S)-氮杂- MBH 以高产率和优异的对映体过量加合物 4。这些催化条件使得脂肪族亚胺首次被用作 aza-MBH 反应的亲电伙伴。发现具有不同酸性强度的两个 H 键供体的共存对于观察到的高对映选择性至关重要。
BHATT S. B.; KHUNT V. N.; PARIKH A. R., J. INST. CHEM., 1978, 50, NO 2, 89-90
作者:BHATT S. B.、 KHUNT V. N.、 PARIKH A. R.
DOI:——
日期:——
Photoredox-Mediated Mono- and Difluorination of Remote Unactivated Methylene C(sp<sup>3</sup>)–H Bonds of <i>N</i>-Alkyl Sulfonamides
作者:Zhiqiang Deng、Zhenxiang Zhao、Gang He、Gong Chen
DOI:10.1021/acs.orglett.1c01020
日期:2021.5.7
A photoredox-mediated δ-C(sp3)–H fluorination of sulfonyl-protected primary alkylamines with Selectfluor is developed. The reaction can proceed in excellent monofluorination selectivity for amine substrates without α substituent. For α-substituted substrates, a slightly modified reaction conditions with two rounds of operation gives the δ,δ-difluorination products in good yield. Mechanistic studies