The most widely used Oand N-debenzylation method in organic synthesis is hydrogenolysis catalyzed by palladium on carbon (Pd/C) or palladium hydroxide on carbon (Pd(OH)2/C). [1] Here we report our finding that a combination of Pd/C and Pd(OH)2/C serves as a better catalyst than either catalyst alone. While working on a project where debenzylation of ether I was required to make alcohol II (Scheme 1)
Bis basic substituted diaminobenzobisthiazoles as potential antiarthritic agents
作者:Ernest Cullen、Reinhold Becker、Kurt Freter、Thelma LeClerq、Genus Possanza、Hin Chor Wong
DOI:10.1021/jm00080a022
日期:1992.1
A series of benzobisthiazoles were screened for antiinflammatory activity in the carrageenan paw edema and adjuvant arthritis tests. Compound 26, 2,6-bis(N,N-diethylamino)benzo[1,2-d:5,4-d']bisthiazole, was found to inhibit the swelling of the uninjected paw in the prophylactic adjuvant arthritis model with an ED50 of 2.3 mg/kg orally. As with most compounds of this series, 26 was inactive in acute
[EN] MYOGLOBIN-BASED CATALYSTS FOR CARBENE TRANSFER REACTIONS<br/>[FR] CATALYSEURS À BASE DE MYOGLOBINE POUR RÉACTIONS DE TRANSFERT DE CARBÈNE
申请人:UNIV ROCHESTER
公开号:WO2016086015A1
公开(公告)日:2016-06-02
Methods are provided for carrying out carbene transfer transformations such as olefin cyclopropanation reactions, carbene heteroatom-H insertion reactions (heteroatom = N, S, Si), sigmatropic rearrangement reactions, and aldehyde olefination reactions with high efficiency and selectivity by using a novel class of myoglobin-based biocatalysts. These methods are useful for the synthesis of a variety of organic compounds which contain one or more new carbon-carbon or carbon-heteroatom (N, S, or Si) bond. The methods can be applied for conducting these transformations in vitro (i.e., using the biocatalyst in isolated form) and in vivo (i.e., using the biocatalyst in a whole cell system).
Sulfonamidocarboxamides of the formula ##STR1## wherein A, M, Q, X and Y have the significance given in the description, as well as hydrates, solvates and salts thereof, which inhibit thrombin-induced blood platelet aggregation and clotting of fibrinogen in plasma, as described. The compounds of formula I can be prepared by amidination of a cyclic amino group standing for grouping X or by C(O)N(Q) amide formation.
The ammonolysis of three morpholine‐2,5‐dione derivatives was investigated and the mechanism ascertained by kinetic studies and theoretical calculations. The kinetics, followed by high‐performance liquid chromatography analysis, evidenced the presence of two intermediates, which were isolated and characterized. The ammonolysis occurs with a complex mechanism involving two consecutive reactions followed