Iron-Mediated Carboarylation/Cyclization of Propargylanilines with Acetals: A Concise Route to Indeno[2,1-c]quinolines
摘要:
FeCl3- and FeBr3-mediated tandem carboarylation/cyclization of propargylanilines with diethyl benzaldehyde acetals furnished the tetracyclic core of indeno[2,1-c]quinolines. 5-Tosyl-6,7-dihydro-5H-indeno[2,1-c]quinoline and 7H-indeno[2,1-c]quinoline derivatives were obtained in good to excellent yields, respectively, by tuning the FeX3 loadings and/or reaction temperatures.
Development of a SO
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H‐Functionalized UiO‐66 Metal–Organic Framework by Postsynthetic Modification and Studies of Its Catalytic Activities
作者:Yi Luan、Nannan Zheng、Yue Qi、Jie Yu、Ge Wang
DOI:10.1002/ejic.201402509
日期:2014.9
A novel metal–organicframework UiO-66-NH2-derived Bronsted acid catalyst was synthesized on a gram scale by employing a postsyntheticmodification strategy under mild conditions. The nanomorphology of the catalyst was designed and developed to enhance itscatalytic performance. Acetalization and benzimidazole formation were evaluated to demonstrate the high reactivity and selectivity of the nanoscaled
Microbial resolution of organometallic planar chirality. Enantioselective reduction of orto- and meta-substituted tricarbonylchromium benzaldehydes by bakers' yeast
作者:Siden Top、Gérard Jaoeun、Clara Baldoli、Paola Del Buttero、Stefano Maiorana
DOI:10.1016/0022-328x(91)80043-j
日期:1991.8
ortho- and meta-substituted (η-benzaldehyde)tricarbonylchromium(0) complexes can be enantioselectively reduced by commercial bakers' yeast to give alcohols and unchanged aldehydes with good to high enantiomeric excesses.
Process for preparing 3,5:4,6- protected derivatives of L- or D- gulonic acid, their use in preparing 2- keto-L- or D- gulonic acid or their esters or L- or D- ascorbic acid, and certain novel 2-nitrato-gulonate intermediates
申请人:PFIZER INC.
公开号:EP0000243A1
公开(公告)日:1979-01-10
The invention relates to a process in which a 3,5:4,6-protected derivative of L- or D-glulonic acid is prepared by contacting L- or D-gulono-1,4-lactone with an aldehvde dialkyl acetal, or with an aldehyde and an alcohol, in the presence of an acid having a pKa of less than 3. This protected derivative may be oxidised and hydrolysed to 2-keto-L- or D-gulonic acid or ester thereof, which in turn may be hydrolysed to L- or D-ascorbic acid. L-ascorbic acid is of course Vitamin C. The invention also relates to the novel intermediates produced by the above processes.