Accessing novel fluorinated heterocycles with the hypervalent fluoroiodane reagent by solution and mechanochemical synthesis
作者:William Riley、Andrew C. Jones、Kuldip Singh、Duncan L. Browne、Alison M. Stuart
DOI:10.1039/d1cc02587b
日期:——
A new and efficient strategy for the rapid formation of novel fluorinated tetrahydropyridazines and dihydrooxazines has been developed by fluorocyclisation of β,γ-unsaturatedhydrazones and oximes with the fluoroiodane reagent. Mechanochemical synthesis delivered fluorinated tetrahydropyridazines in similar excellent yields to conventional solution synthesis, whereas fluorinated dihydrooxazines were
Substrate directed diastereoselective hydroformylation of acyclic homomethallylic alcohols
作者:Bernhard Breit
DOI:10.1039/a608612h
日期:——
Diastereoselective hydroformylation of acyclic homomethallylic alcohols
with the aid of a catalyst directing group is achieved and the
stereochemical outcome of this reaction is rationalized by analysing the
preferred substrate conformation in solution.
Synthesis of 2-hydroxytetrahydrofurans by Wacker-type oxidation of 1,1-disubstituted alkenes
作者:Rina Tanaka、Saki Komori、Yuhei Shimizu、Yasutaka Kataoka、Yasuyuki Ura
DOI:10.1039/d1ob02277f
日期:——
1,1-Disubstituted alkenes feature high steric hindrance, which renders their Wacker-type oxidation difficult. We demonstrate the stereoselective synthesis of 2-hydroxytetrahydrofurans via the Wacker-type oxidation of 3-methyl-3-buten-1-ols by using a PdCl2(MeCN)2/NO/BQ catalyst system under 1 atm O2 in H2O or H2O/DMF.
1,1-二取代烯烃具有高位阻,这使得它们的瓦克型氧化变得困难。我们通过使用 PdCl 2 (MeCN) 2 /NO/BQ 催化剂体系在 H 2中的 1 atm O 2下通过Wacker 型氧化 3-methyl-3-buten-1-ols展示了 2-羟基四氢呋喃的立体选择性合成。O或H 2 O/DMF。
Dran,R.; Prange,T., Comptes Rendus des Seances de l'Academie des Sciences, Serie C: Sciences Chimiques, 1966, vol. 262, p. 492 - 494
作者:Dran,R.、Prange,T.
DOI:——
日期:——
1,3-Asymmetric Induction in Stereoselective Rhodium-Catalyzed Hydroformylation of Homomethallylic Alcohols⋆
catalyst directing group (CDG) allows an efficientsubstrate-directeddiastereoselectivehydroformylation of acyclic homomethallylic alcohols 5, making use of 1,3-asymmetric induction. The corresponding anti-aldehydes 10 were obtained as the major diastereomer in all cases, with diastereomer ratios of ca. 91:9 (anti:syn). Supporting evidence could be obtained for the ability of the o-DPPB group to act as a