2-硝基苯并呋喃和α-芳基-α-异氰基乙酸酯的非对映和对映选择性脱芳香形式[3 + 2]环加成得到带有3 a ,8 b -二氢-1 H -苯并呋喃[2,3- c ]的三环化合物具有三个连续立体中心的吡咯框架。该反应是通过铜醚有机催化剂实现的。获得的反应产物具有几乎完全的非对映选择性,并且对于许多取代的2-硝基苯并呋喃和异氰乙酸酯具有优异的对映体过量。
2-硝基苯并呋喃和α-芳基-α-异氰基乙酸酯的非对映和对映选择性脱芳香形式[3 + 2]环加成得到带有3 a ,8 b -二氢-1 H -苯并呋喃[2,3- c ]的三环化合物具有三个连续立体中心的吡咯框架。该反应是通过铜醚有机催化剂实现的。获得的反应产物具有几乎完全的非对映选择性,并且对于许多取代的2-硝基苯并呋喃和异氰乙酸酯具有优异的对映体过量。
Preparation of indium nitronates and their Henry reactions
作者:Raquel G. Soengas、Rita Acúrcio、Artur M. S. Silva
DOI:10.1039/c4ob01468e
日期:——
Indium nitronates were readily prepared from commercially available nitroalkanes by transmetallation of the corresponding lithium nitronates with indium salts. The Henryreaction of this indium organometallics with aldehydes afforded β-nitroalkanols in moderate to high yields. The use of chiral sugar aldehydes furnished the corresponding carbohydrate-derived β-nitroalkanols with excellent stereoselectivity
Iminium-Allenamine Cascade Catalysis: One-Pot Access to Chiral 4H-Chromenes by a Highly Enantioselective Michael-Michael Sequence
作者:Xinshuai Zhang、Shilei Zhang、Wei Wang
DOI:10.1002/anie.200906050
日期:2010.2.15
Taking the Michael‐Michael: A cascadeMichael–Michael reaction of aryl or alkyl alkynals, involving an unprecedented iminium–allenaminesequence, is efficiently catalyzed by a chiral diphenylprolinol TBDMS ether, and affords highly functionalized 4H‐chromenes in high yields. TBDMS=tert‐butyldimethylsilyl.
Synthesis, Antiproliferative and Pro-Apoptotic Effects of Nitrostyrenes and Related Compounds in Burkitt's Lymphoma
作者:Andrew J. Byrne、Sandra A. Bright、Darren Fayne、James P. McKeown、Thomas McCabe、Brendan Twamley、Clive Williams、Mary J. Meegan
DOI:10.2174/1573406413666171002123907
日期:2018.2.6
identified as a lead target structure for the development of particularly effective compounds targeting Burkitt's lymphoma (BL). OBJECTIVES The aims of the curent study were to synthesise a panel of nitrostyrene compounds and to evaluate their activity in Burkitt's lymphoma (BL). METHODS A panel of structurally varied compounds were designed and synthesised using Henry Knoevenagel condensation reactions.
A novel approach to the synthesis of morphine alkaloids: the synthesis of (d,l)-thebainone-A
作者:Marcus A. Tius、Michael A. Kerr
DOI:10.1021/ja00041a008
日期:1992.7
A nonconventional approach to the preparation of morphinans has been applied to the total synthesis of thebainone-A and β-thebainone-A. Noteworthy features of this synthesis are the regiospecificity of the Diels-Alder reaction to form 9 and of the enolization-hydroxylation of 11, the unusual aromatization of 14 as well as the selectivity of the intramolecular Michael addition of the of the anine to
Asymmetric Synthesis of Functionalized Chromans via a One-Pot Organocatalytic Domino Michael-Hemiacetalization or -Lactonization and Dehydration Sequence
Starting from2-(nitrovinyl)phenols and various cyclic dicarbonyl nucleophiles, a one-pot thiourea-catalyzed diastereo- and enantioselective synthesis of polyfunctionalized chroman derivatives via a domino Michael-hemiacetalization and dehydration sequence as well as via a domino Michael-lactonization reaction is reported. Cyclopenta[b]chromenes, tricyclic spirochromans, and tetrahydro-1H-xanthenes
从2-(硝基乙烯基)苯酚和各种环状二羰基亲核试剂开始,通过多米诺米歇尔半缩醛化和脱水序列以及多米诺米歇尔-内酰胺化反应,通过一锅硫脲催化的非对映和对映选择性合成多官能化苯并二氢吡喃衍生物。报告。环戊二烯并[ b ]色烯,三环spirochromans,和四氢ħ -xanthenes轴承的各种官能团的可以以这种方式以良好至优异的产率(56-91%)合成并具有非常好的diastereo-(88-99% de)和对映选择性(83-99%ee)。 有机催化-多米诺反应-硫脲-一锅法-色原