Organomanganese(II) Reagents; X1. A Convenient Preparation of Various Acetoxyketones, Keto-nitriles, Keto-esters, Keto-acids, Diketones, and Heterocyclic Ketones (Acylheterocycles) via Acylation of Organomanganese(II) Reagents
of ketones by acylation of organomanganous reagents is studied. Thus acid chlorides in ether, symmetrical acid anhydrides in ether or THF and mixedcarboxylic-carbonicanhydrides (R'COOCOOEt) in ether are compared, they lead to the corresponding ketones with good or excellent yields. Some problems of reproductibility are encountered and discussed when mixedanhydrides R'COOCOOEt are used in THF. The
研究了酰化试剂,溶剂和配体的性质对有机锰试剂酰化制备酮的影响。因此,比较了醚中的酰氯,醚或THF中的对称酸酐以及醚中的混合羧酸碳酸酐(R'COOCOOEt),它们可产生相应的酮,收率良好或优异。在THF中使用混合酸酐R'COOCOOEt时,会遇到一些生殖问题。添加多种助溶剂(例如C 6 H 6,AcOEt,CO 3 Et 2,CH 2 CN,CH 2CL 2。在加入酰化剂之前,向反应混合物中加入。)不会影响酮的收率。相比之下,几种配体(例如Me 2 S或Ph 3 P)与有机锰试剂的络合对它们的酰化作用没有后续作用。选择溶剂或配体的主要限制是使用氨基衍生物,这通常会导致酮的产率非常低(例如C 5 H 5 N,TMEDA,Et 3 N)或产率无法再现(例如HMPA)。描述了这些研究的两个应用:
Organomanganese (II) reagents XII: An efficient one-pot preparation of unsymmetrical secondary or tertiary alcohols
作者:G Cahiez、J Rivas-Enterrios、H Granger-Veyron
DOI:10.1016/s0040-4039(00)84973-4
日期:1986.1
Various unsymmetrical secondary or tertiary alcohols have been prepared in high yields by an efficient one-pot procedure involving the acylation of an organomanganese reagent by an acyl chloride and addition to the ketone formed of various organometallic compounds (RLi, RmgX, LiAlH4, NaBH4. The complexation of the intermediate ketone by the metallic salts present in the reaction mixture allows to perform
Organomanganese (II) reagents XV. Conjugate addition of organomanganese reagents to alkylidenemalonic esters and related compounds
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4020(01)81312-0
日期:1989.1
Organomanganese reagents react with alkylidenemalonic esters or related compounds to give the conjugateaddition products in good yields. Several examples illustrate the scope and the efficiency of this reaction
Diastereoselective addition of organomanganese compounds to chiral polyalkoxyaldehydes
作者:A. N. Kasatkin、I. P. Podlipchuk、R. K. Biktimirov、G. A. Tolstikov
DOI:10.1007/bf00704203
日期:1993.6
Organomanganesecompounds RMnI (R=Me, Pr, Bu, Hex, Ph, BuC≡C) prepared from RLi and MnI2 in Et2O react with 3-O-benzyl-1,2-O-isopropylidene-α-D-xylo-pentodialdo-1, 4-furanose, 1,2∶3,4-di-O-isopropylidene-α-D-galacto-hexodialdo-1,5-pyranose, andR-2,3-dibenzyloxypropanal to afford 4,5-threo-, 5,6-threo-, and 2,3-threo-isomeric products, respectively, with high diastereoselectivity.
Synthesis and reactivity of methyl γ-azido butyrates and ethyl σ-azido valerates and of the corresponding acid chlorides as useful reagents for the aminoalkylation
作者:N. Khoukhi、M. Vaultier、R. Carrié
DOI:10.1016/s0040-4020(01)81492-7
日期:1987.1
corresponding acid chlorides 22 and 23 are shown to be interesting reagents for the nucleophilic and electrophilic aminoalkylation. α-substituted methyl γ-azidobutyrates 13 and ethyl σ-azido valerates 14 are easily accessible by alkylation of the lithium enolates of the parent compounds 13a and 14a respectively. Their chemoselective reduction leads to 3-substituted lactams 18 and 19. The acid chlorides