Decalin systems with alpha- and beta-allylic alcohol groups have been subjected to the Stork silyl methyl radical cyclisation reaction to introduce a hydroxymethyl function at the angular position.
Decalin systems with alpha- and beta-allylic alcohol groups have been subjected to the Stork silyl methyl radical cyclisation reaction to introduce a hydroxymethyl function at the angular position.
Hydrazines and Azides via the Metal-Catalyzed Hydrohydrazination and Hydroazidation of Olefins
作者:Jérôme Waser、Boris Gaspar、Hisanori Nambu、Erick M. Carreira
DOI:10.1021/ja062355+
日期:2006.9.1
which the H and the N atoms come from two different reagents, a silane and an oxidizing nitrogen source (azodicarboxylate or sulfonyl azide). The hydrohydrazination reaction using di-tert-butyl azodicarboxylate is characterized by its ease of use, large functional group tolerance, and broad scope, including mono-, di-, tri-, and tetrasubstituted olefins. Key to the development of the hydroazidation
报道了 Co 和 Mn 催化的烯烃加氢肼和加氢叠氮化反应的发现、研究和实施。这些反应等效于 CC 双键与受保护的肼或偶氮酸的直接加氢胺化,但基于不同的概念,其中 H 和 N 原子来自两种不同的试剂,硅烷和氧化性氮源(偶氮二羧酸或磺酰叠氮化物) )。使用偶氮二羧酸二叔丁酯的加氢肼反应具有使用方便、官能团耐受性大、适用范围广的特点,包括单、二、三和四取代烯烃。氢叠氮化反应发展的关键是使用磺酰叠氮化物作为氮源和叔丁基过氧化氢的活化作用。发现该反应对于单、二和三取代烯烃的官能化是有效的,并且只有少数官能团是不能容忍的。获得的烷基叠氮化物是通用中间体,可以在不分离叠氮化物的情况下转化为游离胺或三唑。初步的机理研究表明,烯烃的氢化钴是限速的,然后是胺化反应。不能排除并可能涉及自由基中间体。然后进行胺化反应。不能排除并可能涉及自由基中间体。然后进行胺化反应。不能排除并可能涉及自由基中间体。
Cobalt(II)-porphyrin catalyzed selective functionalization of alkanes with sulfurylchloride: A remarkable substituent effect
Cobalt(II)-porphyrin complex 1 and 2 catalyses the chlorination and sulfochlorination respectively of n-alkanes and cycloalkanes with sulfurylchloride in benzene. The p-substituent of the benzene ring in the porphyrin complex 1 and 2 shows a remarkable chemoselectivity in these reactions.
Aliphatic C–H activation with aluminium trichloride–acetyl chloride: expanding the scope of the Baddeley reaction for the functionalisation of saturated hydrocarbons
作者:Catherine L. Lyall、Mario Uosis-Martin、John P. Lowe、Mary F. Mahon、G. Dan Pantoş、Simon E. Lewis
DOI:10.1039/c2ob26765a
日期:——
activation and here we demonstrate its applicability to a range of other saturated hydrocarbons. Structural elucidation of the products is described and a mechanistic rationale for their formation is presented. The “aliphatic Friedel–Crafts” procedure allows for production of novel oxygenated building blocks from abundant hydrocarbons and as such can be considered to add significant synthetic value in a single
The Synthesis of Cycloalkenes by the IntramolecularWittig Reaction
作者:Konrad B. Becker
DOI:10.1002/hlca.19770600110
日期:1977.1.26
A simple synthesis of a series of bicyclo[m.n.0]-1-alkenes (m, n = 3,4,5) from 2-oxocycloalkanecarboxylates by the intramolecularWittigreaction is reported (see p. 70–72). The spectral properties (IR., 1H-NMR. and 13C-NMR.) of these annulated trisubstituted olefins are discussed.
A CONVENIENT PROCEDURE FOR THE TRANSFORMATION OF ALCOHOLS TO OLEFINS AND ALKYL CHLORIDES
作者:Hsing-Jang Liu、Wing Hong Chan、Sing Ping Lee
DOI:10.1246/cl.1978.923
日期:1978.9.5
Treatment of 1° alcohols with N,N-dimethylphosphoramidic dichloride in refluxing 1,2-dimethoxyethane gave the corresponding chlorides. Upon similar treatment, 3° alcohols underwent dehydration giving olefinic products, whereas 2° alcohols afforded olefins or chlorides as predominant products.