Bromolysis and Iodolysis of α,β-Epoxycarboxylic Acids in Water Catalyzed by Indium Halides
摘要:
The ring opening of alpha,beta -epoxycarboxylic acids by bromide and iodide ions has been efficiently carried out in water in high regio- and stereoselective fashion. The iodolysis of trans-beta -monoalkylated epoxycarboxylic acids at pH 4.0 was completely ol-regioselective and anti diastereoselective. The InCl3-catalyzed iodolysis of a variety of alpha,beta -epoxycarboxylic acids at pH 1.5 gave the corresponding anti beta -iodohydrins in 88-95% yields. The one-pot synthesis of the alpha- and beta -hydroxyhexanoic acids, starting from the corresponding alpha,beta -epoxycarboxylic acid 1a by iodolysis followed by reduction of the resulting iodohydrins 4a and 4b by NaBH4-InCl3 in water, has been performed.
[EN] PYRIDOPYRIMIDINE DERIVATIVES USEFUL AS KRAS G12C AND KRAS G12D INHIBITORS IN THE TREATMENT OF CANCER<br/>[FR] DÉRIVÉS DE PYRIDOPYRIMIDINE UTILES EN TANT QU'INHIBITEURS DE KRAS G12C ET DE KRAS G12D DANS LE TRAITEMENT DU CANCER
申请人:AMGEN INC
公开号:WO2021081212A1
公开(公告)日:2021-04-29
Provided herein are KRAS G12C and KRAS G12D inhibitors, composition of the same, and methods of using the same. These inhibitors are useful for treating a number of disorders, including pancreatic, colorectal, and lung cancers.
Homogeneous aqueous oxidation of organic molecules by Oxone® and catalysis by a water-soluble manganese porphyrin complex
作者:Tu-Cai Zheng、David E. Richardson
DOI:10.1016/0040-4039(94)02420-g
日期:1995.2
Peroxymonosulfate (KHSO5) oxidizes a wide variety of water-soluble organic molecules in aqueous solutions, and the reactions are generally more rapid in phosphate buffer (pH 6–7) than in pure water. A water-solubleporphyrin complex, meso-tetrakis(4-N-methylpyridyl)porphyrinatomanganese(III) chloride, catalyzes epoxidation and hydroxylation under neutral pH conditions.
Manganese porphyrin catalyzed homogeneous aqueous oxidation of organic molecules by magnesium monoperoxyphthalate (MMPP)
作者:Tu-Cai Zheng、David E. Richardson
DOI:10.1016/0040-4039(94)02394-q
日期:1995.2
Magnesiummonoperoxyphthalate (MMPP) oxidizes a variety of organic molecules in neutral homogeneous aqueous solutions at room temperature. A water-soluble porphyrin complex, meso-tetrakis(4-N-methylpyridyl)porphyrinatomanganese(III) chloride, Mn(III)TMPyP(4) Cl, acts as an efficient catalyst for the epoxidation and hydroxylation of water-soluble hydrocarbons.
Studies of Acyl-CoA Dehydrogenase Catalyzed Allylic Isomerization: A One-Base or Two-Base Mechanism?
作者:Srikanth Dakoji、Injae Shin、Donald F. Becker、Marian T. Stankovich、Hung-wen Liu
DOI:10.1021/ja962532e
日期:1996.11.13
capable of catalyzing γ-H abstraction to afford the allylic isomerization between α,β- and β,γ-enone thioesters and/or inactivation by 2- or 3-acetylenic acyl-CoA derivatives. Although a dual role has been proposed for the glutamate residue in both α- and γ-deprotonation, the existence of a second active-site basic group to mediate the observed reactions occurring at γ-C remains a feasible mechanism
Both enantiomers of (S) and (R) isoserine as well (D) and (L) allothreonine are prepared optically pure in three steps by asymmetric Sharpless epoxidation of crotyl and allylic alcohols into - followed by an improved RuCl3/NaIO4/water oxidation procedure to low molecular weight glycidic acids and epoxide opening by ammonia with (20 – 33%) overall yields.