Sulfinate and Carbene Co‐catalyzed Rauhut–Currier Reaction for Enantioselective Access to Azepino[1,2‐
<i>a</i>
]indoles
作者:Xingxing Wu、Liejin Zhou、Rakesh Maiti、Chengli Mou、Lutai Pan、Yonggui Robin Chi
DOI:10.1002/anie.201810879
日期:2019.1.8
A carbene and sulfinate co‐catalyzed intermolecular Rauhut–Currierreaction between enals and nitrovinyl indoles is disclosed. The carbene catalyst activates the enal and the sulfinate co‐catalyst activates the nitrovinyl indole. Both activation processes are realized via the formation of covalent bonds between the catalysts and substrates to generate catalyst‐bound intermediates. The dual catalytic
揭示了烯与亚硝基吲哚之间的卡宾和亚磺酸盐共催化的分子间Rauhut-Currier反应。卡宾催化剂活化烯醛,亚磺酸盐助催化剂活化硝基乙烯基吲哚。两种活化过程都是通过在催化剂和底物之间形成共价键以生成与催化剂结合的中间体来实现的。双重催化反应可提供具有出色立体选择性的氮杂环庚烷[1,2- a ]吲哚产物。我们的研究表明,亚磺酸盐作为一种有效的亲核催化剂,可以在活化电子不足的烯烃以进行不对称反应中发挥独特作用。这种双重催化方法也应鼓励对亚磺酸盐和卡宾催化剂的未来开发进行新的反应。
Asymmetric Synthesis of Pyrroloindolones by N-Heterocyclic Carbene Catalyzed [2+3] Annulation of α-Chloroaldehydes with Nitrovinylindoles
作者:Qijian Ni、Huan Zhang、André Grossmann、Charles C. J. Loh、Carina Merkens、Dieter Enders
DOI:10.1002/anie.201305957
日期:2013.12.16
NHC‐enolate plus 3: N‐heterocyclic carbenes (NHCs) serve as organocatalysts for the [2+3] annulation of nitrovinylindoles with α‐chloroaldehydes via an intermediate azolium enolate. The method provides trans‐disubstituted pyrroloindolones with good yields and excellent diastereo‐ and enantioselectivities. Further transformations lead to tetracyclic pyrrolo[1,2‐a]indoles with potential psychotropic
NHC-烯酸酯加3:N-杂环卡宾(NHCs)用作有机催化剂,通过中间的偶氮烯醇烯酸酯与α-氯醛进行[2 + 3]的硝基乙烯基吲哚环化。该方法提供了具有良好收率和出色的非对映和对映选择性的反式-双取代吡咯并吲哚酮。进一步的转化导致具有潜在精神活性和其他生物活性的四环吡咯并[1,2- a ]吲哚。
BALABUSHEVICH A. G.; YARESKO N. S.; CYBOPOB N. N., MOSK. XIM.-TEXNOL. IN-T. IM. D. I. MENDELEEVA. M., 1976. 4 S., BIBLIOGR. +
作者:BALABUSHEVICH A. G.、 YARESKO N. S.、 CYBOPOB N. N.
DOI:——
日期:——
BALABUSHEVICH A. G.; YARESKO N. S.; CYBOPOB N. N., ZH. BCEC. XIM. O-BA IM. D. I. MENDELEEVA <ZVKO-A6>, 1975, 20, HO 2, 239-2+
作者:BALABUSHEVICH A. G.、 YARESKO N. S.、 CYBOPOB N. N.
DOI:——
日期:——
One-Pot Organocatalytic Asymmetric Synthesis of 1H-Pyrrolo[1,2a]indol-3(2H)-ones via a Michael-Hemiaminalization-Oxidation Sequence
An efficient one-pot organocatalytic asymmetric synthesis of 1,2-cis-disubstituted 1H-pyrrolo[1,2a]indol-3(2H)-ones in moderate to good overall yields (49-68%) is presented. The Michael-hemiaminalization-oxidation sequence occurs with very high asymmetric induction and, after purification, virtually stereoisomerically pure products were obtained (>98% de, >99% ee).