CAS: 13031-04-4; 4,4-Dimethyldihydrofuran-2,3-Dione

相似化合物

5405-40-3 599-04-2 79-50-5

上下游产品

4-Hydroxy-3,3-Dimethyl-2-Oxobutanoic Acid 470-30-4

📜在 盐酸体系中,用 水 用作溶剂,化学反应生成二氢-4,4-二甲基-2,3-呋喃二酮
参考文献:Process For Producing Intermediate Furanones From Diol Derivative And
标题:Process For Producing Intermediate Furanones From Diol Derivative And
摘要:描述了一种制造式为##str1##的呋喃酮的新工艺.在这个工艺中,首先将二醇与氯化亚砜反应,然后形成的亚硫酸酯,经氧化成相应的硫酸酯后,与氰化钠反应,生成的羟基腈经水解.式i的呋喃酮可用作制造r-(-)-泛酸内酯的起始原料.

专利信息

专利号:US-4879389-A
优先权日:1986-06-25
标题:Chiral phosphinopyrrolidine compounds and their use for asymmetric synthesis of optically active compounds
发明人：ACHIWA KAZUO
权利人:ACHIWA KAZUO
摘要:New chiral phosphinopyrrolidine compounds of the general formula: (I) or (I') wherein R1 is a hydrogen atom, -COR, -COOR, -CONHR or -SO2-R where R is an alkyl or aryl group, R2 and R3 each represents independently an aryl group which may have a substituent or substituents, and R4 and R5 each represents independently an aliphatic or cycloaliphatic hydrocarbyl group which may have a substituent or substituents, as well as the use of these compounds as ligand for a metal complex catalyst for asymmetric synthesis of optically active compounds. The new chiral phosphinopyrrolidine compounds are useful ligands which attain both of high optical yield and high reaction efficiency in catalytic asymmetric reduction.

专利号:US-4985567-A
优先权日:1988-03-07
标题:Chiral phosphinopyrrolidine compounds and their use for asymmetric synthesis of optically active compounds
发明人：ACHIWA KAZUO; TAKEDA HIDEO
权利人:KAZUO ACHIWA; FUJI YAKUHIN KOGYO KK
摘要:New chiral phosphinopyrrolidine compounds of the general formula: ##STR1## wherein R 1 is hydrogen or --COA 1 , --COOA 2 , --CONHA 3 , --SO 2 A 4 or --PO(A 5 ) 2 , A 1 , A 2 , A 3 , A 4 and A 5 each represents independently alkyl or aryl, R 2 is phenyl, di(lower-alkyl)aminophenyl, lower-alkoxyphenyl or 3,5-dimethyl-4-methoxyphenyl, and R 3 is phenyl, lower-alkylphenyl, di(lower-alkyl)aminophenyl, lower-alkoxyphenyl or 3,5-dimethyl-4-methoxyphenyl, with the proviso that R 2 and R 3 may not simultaneously by phenyl, p-di(lower-alkyl)-aminophenyl or p-lower-alkoxyphenyl, as well as the use of these compounds as ligand for a metal complex catalyst for asymmetric synthesis of optically active compounds. The new chiral phosphinopyrrolidine compounds are useful ligands which attain both of high optical yield and high reaction efficiency in catalytic asymmetric reduction.

专利号:EP-0528256-B1
优先权日:1991-08-12
标 题:D-2,4-dihydroxy-3,3-dimethylbutyronitrile, its production and use and process for production of D-pantolactone, D-2,4-dihydroxy-3,3-dimethylbutyramide and D-pantothenic acid
发明人：BEISSWENGER THOMAS DR; HUTHMACHER KLAUS DR; KLENK HERBERT DR
权利人:DEGUSSA
摘要:2.1. D-(-)-Pantolactone is an important intermediate in the synthesis of D-(+)-pantothenic acid or D-panthenol and can be obtained from the racemic compound by elaborate racemate resolution methods in the form of pantoic acid salts with chiral auxiliary bases and subsequent resolution of the pairs of salts with subsequent cyclisation of the pantoic acid. Since this synthesis is very elaborate, the object of the present invention is to provide a more suitable intermediate for pantolactone synthesis, which is to be obtainable straightforwardly and at low cost. 2.2. Such an intermediate is D-2,4-dihydroxy-3,3-dimethylbutyronitrile in an optical purity (D:L) of at least 80:20. D-(-)-pantolactone can be prepared in high yields by hydrolysis of the nitrile with concentrated acids. The nitrile is obtainable by reaction of hydroxypivalaldehyde with hydrogen cyanide in the presence of relatively large amounts of a D-oxynitrilase. 2.3. Preparation of D-(-)-pantolactone and D-(+)-pantothenic acid.

专利号:US-8653223-B2
优先权日:2008-04-16
标题:Transketalized compositions, synthesis, and applications
发明人：SELIFONOV SERGEY; GOETZ ADAM EDWARD; JING FENG
权利人:SELIFONOV SERGEY; GOETZ ADAM EDWARD; JING FENG; SEGETIS INC
摘要:Ketal compounds of the structure I n nand a method of preparation of the compound from polyols and oxocarboxylates, as well as uses thereof.

专利号:US-8546519-B2
优先权日:2007-10-09
标题 :Polyketal compounds, synthesis, and applications
发明人：SELIFONOV SERGEY; ROTHSTEIN SCOTT D; WICKS DOUGLAS A; MULLEN BRIAN D; MULLEN TARA J; PRATT JASON D; WILLIAMS CHARLES T; WU CHUNYONG; ZHOU NING
权利人:SELIFONOV SERGEY; ROTHSTEIN SCOTT D; WICKS DOUGLAS A; MULLEN BRIAN D; MULLEN TARA J; PRATT JASON D; WILLIAMS CHARLES T; WU CHUNYONG; ZHOU NING; SEGETIS INC
摘要:The invention relates to polyketal compounds. The compounds are synthesized by the selective ketalization of oxocarboxylic acids, e.g. keto acids and semialdehydes, and esters thereof with tetrols and higher polyols that products two or more cyclic ketal ester moieties per molecule, wherein the cyclic ketal moieties are situated in a bis-, tris-, or polyketal conformation. The invention further relates to applications of these compounds and subsequent reactions thereof.

专利号:CN-117987401-A
优先权日:2022-11-07
标题:Aldolase for the synthesis of vitamin B5