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.
Enantioselective organocatalytic domino Michael–acetalization–Henry reactions of 2-hydroxynitrostyrene and aldehyde for the synthesis of tetrahydro-6H-benzo[c]chromenones
作者:Bor-Cherng Hong、Prakash Kotame、Ju-Hsiou Liao
DOI:10.1039/c0ob00834f
日期:——
Asymmetric domino Michael–acetalization reactions of 2-hydroxynitrostyrene and aldehydes “on water” followed by oxidation providing the cis-3,4-disubstituted dihydrocoumarins with excellent enantioselectivities (up to >99% ee). The variant with glutaraldehyde underwent a highly stereoselective domino Michael–acetalization–Henry reaction to afford the tetrahydro-6H-benzo[c]chromen-6-ones after the subsequent
不对称多米诺骨牌迈克尔缩醛化反应 2-羟基硝基苯乙烯 和醛“上 水然后进行氧化,使顺式-3,4-二取代的二氢香豆素具有出色的对映选择性(高达> 99%ee)。具有的变体戊二醛进行高度立体选择性的多米诺骨牌Michael-缩醛化-Henry反应,在随后的氧化反应后得到四氢-6 H-苯并[ c ] chromen-6-one。
Organocatalytic Asymmetric Tandem Michael Addition−Hemiacetalization: A Route to Chiral Dihydrocoumarins, Chromanes, and 4<i>H</i>-Chromenes
作者:Dengfu Lu、Yajun Li、Yuefa Gong
DOI:10.1021/jo101446d
日期:2010.10.15
Asymmetric tandem Michael addition−hemiacetalization between aliphatic aldehydes and (E)-2-(2-nitrovinyl)phenols was investigated for constructing benzopyran backbones. Interestingly, the diastereo- and enantioselectivities changed markedly when the reaction was mediated by different types of secondary amine catalysts. The diphenylprolinol silyl ether 7 promoted the reaction with excellent enantioselectivities
Stereocontrolled construction of 3H-furo[3,4-b]chromen-1(9H)-one scaffolds via organocatalyzed Michael addition and the following intramolecular dehydration
An efficient approach for the stereocontrolledconstruction of 3H-furo[3,4-b]chromen-1(9H)-oneskeleton has been successfully developed through a sequential Michael addition/intramolecular dehydration strategy. The Michael addition of tetronic acid to 2-((E)-2-nitrovinyl)phenols catalyzed by a bifunctional squaramide derived from L-tert-leucine, and the subsequent intramolecular dehydration promoted
通过顺序迈克尔加成/分子内脱水策略,成功开发了一种立体控制3 H-呋喃并[3,4- b ] chromen-1(9 H)-骨架的有效方法。迈克尔加成特窗酸的2 - ((Ë)-2-硝基乙烯基)苯酚通过衍生自双官能squaramide催化大号-叔-亮氨酸,和由浓硫酸促进了随后的分子内脱水,顺利进行,得到相应的药学上有价值的3 H-呋喃并[3,4- b ] chromen-1(9 H)-one,可接受的收率为ee的79–97%。