公开(公告)号：US4096265A

公开(公告)日：1978-06-20

申请号：US739546

申请日：1976-11-08

申请人： Anil Chandra Ghosh ,  Raj Kumar Razdan

发明人： Anil Chandra Ghosh ,  Raj Kumar Razdan

IPC分类号： C07D491/04 ,  C07D491/052 ,  A61K31/44

CPC分类号： C07D491/04 ,  Y10S514/929

摘要： Benzopyrano[3,4-d]pyridine-2-cyano, carboxamidoximes and carboximidates of the formula ##STR1## wherein R represents -C.ident.N, ##STR2## R.sub.1 is a lower alkyl, R.sub.2 is hydrogen or a lower alkyl and R.sub.3 is a straight or branched alkyl having 1 to 20 carbons, a cycloalkyl-lower alkyl group in which the cycloalkyl group has 3 to 8 carbons or it is an arylalkyl group, and R.sub.4 is a lower alkyl group.The compounds are useful for lowering blood pressure.

摘要翻译： 苯并吡喃并[3,4-d]吡啶-2-氰基，甲酰氨基肟和式ⅩⅧ的肟基，其中R表示-C = N，R 1是低级烷基，R 2是氢或低级烷基，R 3是 碳原子数为1〜20的直链或支链烷基，环烷基为碳原子数为3〜8的环烷基 - 低级烷基或芳基烷基，R4为低级烷基。

公开(公告)号：US5808117A

公开(公告)日：1998-09-15

申请号：US589708

申请日：1996-01-22

申请人： Pritish Kumar Chowdhury ,  Manobjyoti Bordoloi ,  Nabin Chandra Baraua ,  Heramba Prasad Sarmah ,  Pradip Kumar Goswami ,  Ram Prakash Saharma ,  Ajoy Pratap Baruah ,  Raj Kumar Mathur ,  Anil Chandra Ghosh

发明人： Pritish Kumar Chowdhury ,  Manobjyoti Bordoloi ,  Nabin Chandra Baraua ,  Heramba Prasad Sarmah ,  Pradip Kumar Goswami ,  Ram Prakash Saharma ,  Ajoy Pratap Baruah ,  Raj Kumar Mathur ,  Anil Chandra Ghosh

IPC分类号： C07J7/00

CPC分类号： C07J7/00 ,  C07J13/005 ,  C07J7/0035 ,  C07J71/0005

摘要： The invention relates to a process for producing 16-Dehydropregnenolone acetate (16DPA) of the formula shown below ##STR1## which process comprises a) acetolysis of diosgenin of the formula shown below ##STR2## by heating in a pressure reactor in the presence of an acetylating agent and a non-polar solvent, maintaining the pressure in the reactor in the range of 4-6 kg/cm.sup.2 and at a temperature in the range of 200.degree.-250.degree. C. to produce pseudodiosgenine acetate of the formula shown below ##STR3## b) Oxidizing the so obtained pseudodiosgenin acetate to obtain diosone of the formula shown below ##STR4## and, c) Hydrolysis and degradation of the diosone so obtained to produce the said 16-Dehydropregnenolone acetate.

摘要翻译： 本发明涉及一种生产下文所示的16-去氢孕烯醇酮醋酸酯（16DPA）的方法，该方法包括：a）在压力反应器中，在 乙酰化剂和非极性溶剂，将反应器中的压力保持在4-6kg / cm 2的范围内，并在200-250℃的温度范围内，以产生下述式 b）氧化所得到的假性子糖过氧化物乙酸酯以获得下文所示的式子的二酮，并且c）如此获得的二酮的水解和降解以产生所述的16-脱氢孕烯醇酮醋酸酯。

公开(公告)号：US5801239A

公开(公告)日：1998-09-01

申请号：US785471

申请日：1997-01-17

申请人： Chowdhury Nath Saikia ,  Tridip Goswami ,  Anil Chandra Ghosh

发明人： Chowdhury Nath Saikia ,  Tridip Goswami ,  Anil Chandra Ghosh

IPC分类号： C08B11/12 ,  C07H1/00 ,  C08B11/00 ,  C08B15/05

CPC分类号： C08B11/12

摘要： This invention relates to a process for the preparation of alkali salt of carboxyalkyl cellulose with good solubility in salt water which is useful for pertroleum drilling muds, which comprises (a) powdering high alpha cellulose obtained from fast growing plants or bamboo pulp, (b) preparing the alkali metal salt of cellulose by mixing the high alpha cellulose pulp obtained from fast growing plant or bamboo with an alkalinating agent in the presence of an inert organic solvent, (c) etherifying the prepared alkali cellulose to alkali metal salt of cellulose with an etherifying agent at a temperature in the range of 70.degree.-80.degree. C., (d) recovering the alkali metal salt of carboxyalkyl cellulose and (e) drying the resulting alkali metal salt of carboxalkyl cellulose.

摘要翻译： 本发明涉及一种制备在盐水中具有良好溶解性的羧基烷基纤维素的碱盐的方法，其用于石油钻井泥浆，其包括（a）粉碎由快速生长的植物或竹浆获得的高α纤维素，（b） 通过将由快速生长的植物或竹子获得的高α纤维素纸浆与碱化剂在惰性有机溶剂的存在下混合制备纤维素的碱金属盐，（c）将制备的碱纤维素与纤维素的碱金属盐醚化， （d）回收羧基烷基纤维素的碱金属盐，（e）干燥得到的羧基烷基纤维素的碱金属盐。