Versatile synthesis of 2′-amino-2′-deoxyuridine derivatives with a 2′-amino group carrying linkers possessing a reactive terminal functionality
作者:Andrzej Gondela、Mateusz D. Tomczyk、Łukasz Przypis、Krzysztof Z. Walczak
DOI:10.1016/j.tet.2016.07.061
日期:2016.9
2,2′-Anhydrouridine has been successfully converted into the appropriate 2′-amino-2′-deoxyuridine derivatives in a reaction with isothiocyanates obtained from amino acids or α,ω-diaminoalkanes. The initially formed oxazolidine-2-thione ring is cleaved under basic conditions into the corresponding 2′-amino(substituted)-2′-deoxyuridine derivatives. The implemented additional terminal functionality in
compounds that avoids the synthesis of isoselenocyanates and does not require multistep synthesis. A one-pot protocol for the synthesis of selenoureidopeptides employing lithiumaluminumhydride hydroselenide (LiAlHSeH) as a selenating agent via a Staudinger aza-Wittig-type reaction is reported. The protocol involves the use of Nα-protected aminoalkyl azides and isothicyanato esters to afford the desired
Method of fixing and bleach-fixing a silver halide photographic material
申请人:Fuji Photo Film Co., Ltd.
公开号:US05401621A1
公开(公告)日:1995-03-28
A process for processing an imagewise exposed silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, comprising the steps of developing in a developing bath and processing in a bath having a fixing ability, wherein the bath having the fixing ability contains at least one mesoionic compound represented by formula (I): ##STR1## In a second embodiment, a process is disclosed for processing an imagewise exposed silver halide color photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, comprising the steps of subjecting the material to color development, and then subjecting the material to blix in a blix bath, wherein the blix bath contains at least one mesoionic compound represented formula (III) or (IV): ##STR2##
Substituted benzimazoles which inhibit platelet aggrecation
申请人:SmithKline Beecham Corporation
公开号:US05741804A1
公开(公告)日:1998-04-21
This invention relates to compounds of the formula: ##STR1## which are effective for inhibiting platelet aggregation, pharmaceutical compositions for effecting such activity, and a method for inhibiting platelet aggregation.