Cyclization and Ring-Expansion Processes Involving Samarium Diiodide Promoted Reductive Formation and Subsequent Oxidative Ring Opening of Cyclopropanol Derivatives
convert to cyclic conjugated enones in moderate to good yields. In addition, the reduction−oxidation reaction sequences can be successfully performed in one pot. The regioselectivities of cyclopropane ringopening in the bicyclic substrates depend on the oxidizing agents used. For example, reactions promoted by FeCl3 with pyridine lead to the expected ring-expansion process involving internal-bond cleavage
io二碘化物促进了各种α-溴甲基环烷酮的反应,然后用三甲基甲硅烷基氯进行处理,导致嵌在双环[ m .1.0]烷烃骨架中的环丙基甲硅烷基醚的生产。用氧化性电子转移试剂(例如Fe(III),Ce(IV)和Mn(III)盐)处理醚时,会生成扩环酮,并以中等至良好的产率转化为环状共轭烯酮。另外,还原氧化反应序列可以在一锅中成功进行。双环底物中环丙烷开环的区域选择性取决于所用的氧化剂。例如,FeCl 3促进的反应用吡啶导致预期的扩环过程,该过程涉及双环烷烃的内部键裂解并产生环烯酮作为最终产物。相反,与Ce(NH 4)2(NO 3)6或Mn(OAc)3作为氧化剂的反应通过外键裂解进行,得到α-碘甲基环烷酮。
Enantioselective Lactonization by π‐Acid‐Catalyzed Allylic Substitution: A Complement to π‐Allylmetal Chemistry
Asymmetricallylic alkylation (AAA) is a powerful method for the formation of highly useful, non-racemic allylic compounds. Here we present a complementary enantioselective process that generates allylic lactones via π-acid catalysis. More specifically, a catalytic enantioselective dehydrative lactonization of allylicalcohols using a novel PdII-catalyst containing the imidazole-based P,N-ligand (S)-StackPhos
Metal-mediated two-atom carbocycle enlargement in aqueous medium
作者:Chao-Jun Li、Dong-Li Chen、Yue-Qi Lu、John X. Haberman、Joel T. Mague
DOI:10.1016/s0040-4020(98)00004-0
日期:1998.3
fourteen-membered ring derivatives respectively. Tetralone derivatives are similarly expanded to 6–8 fused ring systems; and indanone derivatives are expanded to 5–7 fused ring systems. The use of both indium and zinc as the metal mediators provided the ring expansion products successfully. The use of water as a solvent was found to be essential for the ring expansion reaction.
DIHYDROINDAZOLE COMPOUNDS USEFUL IN TREATING IRON DISORDERS
申请人:Cadieux Jean-Jacques
公开号:US20080234327A1
公开(公告)日:2008-09-25
This invention is directed to compounds of formula (I):
wherein
m, R
1
, R
2
, R
3
and R
4
are as defined herein, as a stereoisomer, enantiomer, tautomer thereof or mixtures thereof; or a pharmaceutically acceptable salt, solvate or prodrug thereof, for the treatment of iron disorders. This invention is also directed to pharmaceutical compositions comprising the compounds and methods of using the compounds to treat iron disorders.
Process for the production of optically active amino alcohols
申请人:Takasago International Corporation
公开号:EP1398310A1
公开(公告)日:2004-03-17
The disclosure describes a process for the preparation of cyclic optically active amino alcohols of formula (I) by reacting an optically active hydroxycarboxylate of formula (IV) with hydrazine to form an optically active hydroxycarboxylic hydrazide compound of formula (III), then conducting a Curtius reaction in the presence of an alcohol to give an optically active alkoxycarbonylamino alcohol of formula (II), followed by deprotecting the amino group to form the amino alcohol of formula (I).
The variables A1, A2, R1-R6, m, n and * are as defined in the claims.