Highly Selective Deblocking of Propargyl Carbonates in the Presence of Propargyl Carbamates with Tetrathiomolybdate
摘要:
Propargyloxycarbonyl chloride, 1, has been used to protect the hydroxyl and amino functionalities of amino alcohols and aminophenols in one pot using triethylamine or pyridine as a base. The increased reactivity of benzyltriethylammonium tetrathiomolybdate, 2, toward propargyl carbonates over propargyl carbamates is studied in detail and has been exploited further to develop an orthogonal protection strategy for the hydroxyl and amino functionalities. For example, 2-amino-1-butanol, 6a, was treated with 1 to get the N,O-diPoc compound 7a in 90% yield, which when treated with 1.1 equiv of 2 at room temperature removes the Poc group attached to oxygen while leaving the one attached to nitrogen intact to yield compound Sa in 85% yield. This particular observation offers a new protecting strategy where an amine and an alcohol group can be protected simultaneously in one pot, and in a later synthetic step, if the alcohol group has to be deprotected selectively, it can be achieved with 1 equiv of 2.
ACTINIC RADIATION CURABLE MAGENTA INK COMPOSITION, ACTINIC RADIATION CURABLE INK JET RECORDING MAGENTA INK AND METHOD FOR IMAGE FORMATION AND INK JET RECORDING APPARATUS USING SAID INK, AND ACTINIC RADIATION CURABLE PRINTING MAGENTA INK
申请人:Konica Minolta Medical & Graphic, Inc.
公开号:EP1829938A1
公开(公告)日:2007-09-05
An actinic radiation curable magenta ink composition containing a quinacridone series pigment, a dispersing agent, a photo-polymerizable compound and a photo-polymerization initiator, wherein a surface of a coated layer with the magenta ink composition on a porous medium exhibits a 60°-glossiness defined in JIS K 5600 in the range of 95 to 140, provided that the coated layer is formed by coating the magenta ink composition with a bar coater on the porous medium having a void ratio of 50 to 70% and a 60°-glossiness defined in JIS K 5600 of 30 or more, and then standing still for 30 minutes.
一种可辐照固化的品红色油墨组合物,含有喹吖啶酮系列颜料、分散剂、可光聚合化合物和光聚合引发剂,其中在多孔介质上使用该品红色油墨组合物的涂布层表面呈现出在 JIS K 5600 中定义的 95 至 140 范围内的 60°光泽度、前提是涂布层是通过在空隙率为 50 至 70%、60°-光泽度(JIS K 5600 定义)为 30 或以上的多孔介质上用条形涂布机涂布品红色油墨组合物,然后静置 30 分钟形成的。