Synthesis of 2,3,4-Trisubstituted Thiochromanes using an Organocatalytic Enantioselective Tandem Michael-Henry Reaction
作者:Rajasekhar Dodda、Joshua J. Goldman、Tanmay Mandal、Cong-Gui Zhao、Grant A. Broker、Edward R. T. Tiekink
DOI:10.1002/adsc.200700331
日期:2008.3.7
Enantioenriched 2,3,4-trisubstituted thiochromanes have been synthesized by using a cupreine-catalyzed tandem Michael addition-Henry reaction between 2-mercaptobenzaldehydes and beta-nitrostyrenes. Good diastereoselectivities and enantioselectivities were obtained for the title compounds, which may be further improved through a single recrystallization (up to 98% de and> 99% ee).
通过使用 2-巯基苯甲醛和 β-硝基苯乙烯之间的铜催化串联迈克尔加成-亨利反应合成了对映体富集的 2,3,4-三取代硫代苯并二氢吡喃。标题化合物获得了良好的非对映选择性和对映选择性,可以通过单次重结晶进一步改进(高达 98% de 和 > 99% ee)。
[EN] COMPOUNDS FOR OPTICALLY ACTIVE DEVICES<br/>[FR] COMPOSÉS POUR DISPOSITIFS OPTIQUEMENT ACTIFS
申请人:MERCK PATENT GMBH
公开号:WO2017032442A1
公开(公告)日:2017-03-02
The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for ophthalmic devices as well as to ophthalmic devices comprising such compounds.
Synthesis of 2,2-Difluorinated 4-Isoflavanols/4-Thioisoflavanols via a Base-Catalyzed [4 + 2] Annulation Reaction of <i>gem</i>-Difluoroolefins
作者:Jiaheng Li、Cong Xu、Na Wei、Mang Wang
DOI:10.1021/acs.joc.7b01635
日期:2017.11.3
DBU-catalyzed sequential intermolecular and intramolecular nucleophilic addition reactions between gem-difluoroolefins and o-hydroxy/mercapto benzaldehydes have been developed to provide a [4 + 2] annulation strategy for facile synthesis of gem-difluorinated isoflavanol derivatives. The competitive addition–elimination reaction of gem-difluoroolefins with nucleophiles was avoided under mild conditions,
Organocatalytic highly enantioselective tandem Michael–Knoevenagel reaction for the synthesis of substituted thiochromanes
作者:Rajasekhar Dodda、Tanmay Mandal、Cong-Gui Zhao
DOI:10.1016/j.tetlet.2008.01.113
日期:2008.3
Enantioenriched tetrasubstituted thiochromanes have been synthesized using a tandem Michael addition-Knoevenagel reaction between 2-mercaptobenzaldehydes and benzylidenemalonates with a 9-epi-aminoquinine thiourea derivative as the catalyst. Steric and electron effects were found to affect profoundly the enantioselectivity and diastereoselectivity of the reaction.
The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for ophthalmic devices as well as to ophthalmic devices comprising such compounds.