Synthesis of the C6C16 polyene fragment of ratjadone, a potent cytotoxic metabolite from Sorangium cellulosum
摘要:
The Pd-catalyzed synthesis of the polyene fragment of ratjadone is described. This strategy employs the Stille-coupling for the coupling of the tetrahydropyran subunit and the Suzuki coupling for attaching the unsaturated lactone to the polyene chain. (C) 1999 Elsevier Science Ltd. All rights reserved.
DIHYDROPYRIMIDINE COMPOUNDS AND THEIR APPLICATION IN PHARMACEUTICALS
申请人:SUNSHINE LAKE PHARMA CO., LTD.
公开号:US20150152096A1
公开(公告)日:2015-06-04
Provided herein are dihydropyrimidine compounds and their pharmaceutical applications, especially for use in treating and preventing HBV diseases. Specifically, provided herein are compounds having Formula (I) or (Ia), or an enantiomer, a diastereoisomer, a tautomer, a hydrate, a solvate, or a pharmaceutically acceptable salt thereof, wherein the variables of the formulas are as defined in the specification. Also provided herein is the use of the compounds having Formula (I) or (Ia), or an enantiomer, a diastereoisomer, a tautomer, a hydrate, a solvate, or a pharmaceutically acceptable salt thereof for treating and preventing HBV diseases.
1-Alkoxyallene as an Effective Precursor for Regio- and Stereocontrolled Allylation Reactions with Aliphatic Aldehydes via Bis-Stannylation
作者:David R. Williams、Micheal W. Fultz
DOI:10.1021/ja054201k
日期:2005.10.1
Bis-stannylation of 1-(methoxy)methoxyallene yields (E)-(3-(methoxymethoxy)prop-2-ene-1,2-diyl) bis-tributylstannane (2) as a highly reactive allylation reagent. Stereoselectivereactions of functionalized stannane 2 with a variety of aldehydes provide good yields of 1,2-diol derivatives. Reactions with alpha-alkoxyaldehydes proceed with chelation-controlled addition to afford efficient constructions
1-(甲氧基)甲氧基丙二烯的双-甲锡烷基化产生(E)-(3-(甲氧基甲氧基)丙-2-烯-1,2-二基)双-三丁基锡烷(2)作为高反应性烯丙基化试剂。官能化锡烷 2 与各种醛的立体选择性反应提供了良好的 1,2-二醇衍生物产率。与 α-烷氧基醛的反应通过螯合控制加成进行,以在带有三个不同氧(烷氧基和羟基)取代基的立体三联体中有效构建 3,4-反-4,5-syn-关系。提出了机械方面的考虑,核磁共振实验的衍生物支持立体化学分配。包括 X 射线衍射研究。
Intramolecular Michael-Type Additions to Vinyl Bissulfoxides: Enantioselective Synthesis of Chiral Aldehydes
The diastereoselective auxiliary-based intramolecular Michael-type additions to alkylidene bissulfoxides derived from dithiane and dithiolane were investigated. Utilization of substrates bearing N- and O-nucleophilic functions led to the formation of the respective cyclic substrates with selectivities ranging from 51:49 to 85:15. Cleavage of the bissulfoxide moiety by a two-step sequence yielded chiral
Thermal stabilizer composition for halogen containing vinyl polymers
申请人:Rohm and Haas Company
公开号:EP1520875A2
公开(公告)日:2005-04-06
Stabilizer compositions are used to stabilize halogen-containing vinyl polymers from, for example, degradation and discoloration. The stabilizer compositions comprise a zinc mercaptide and a latent mercaptan.
Thermal stabilizer composition for halogen-containing vinyl polymers
申请人:Norris Kelly Gene
公开号:US20050075435A1
公开(公告)日:2005-04-07
Stabilizer compositions are used to stabilize halogen-containing vinyl polymers from, for example, degradation and discoloration. The stabilizer compositions comprise a zinc mercaptide and a latent mercaptan.