Cu-Catalyzed Carbonylative Silylation of Alkyl Halides: Efficient Access to Acylsilanes
作者:Li-Jie Cheng、Neal P. Mankad
DOI:10.1021/jacs.9b12043
日期:2020.1.8
A Cu-catalyzed carbonylative silylation of unactivated alkyl halides has been developed, enabling efficient synthesis of alkyl-substituted acylsilanes in high yield. A variety of functional groups are tolerated under the mild reaction conditions, and primary, secondary and tertiaryalkyl halides are all applicable. The practical utility of this method has been demonstrated in the synthesis of acylsilanes
已开发出未活化的烷基卤化物的 Cu 催化羰基化硅烷化,能够以高产率高效合成烷基取代的酰基硅烷。在温和的反应条件下可耐受多种官能团,伯、仲、叔烷基卤均适用。该方法的实际效用已在带有不同甲硅烷基的酰基硅烷的合成中以及在一锅中将产物原位还原为相应的-羟基硅烷中得到证明。机理实验表明,甲硅烷基铜中间体通过单电子转移激活烷基卤化物以形成烷基自由基中间体,并且碳 - 卤素键断裂不参与速率决定步骤。
Efficient Synthesis of Acylsilanes Using Morpholine Amides
作者:Christopher T. Clark、Benjamin C. Milgram、Karl A. Scheidt
DOI:10.1021/ol0483854
日期:2004.10.1
text] A general synthesis of acylsilanes from the corresponding morpholine amides and silyllithium species is described. The use of morpholine amides is economical and prevents over-addition by the silyl nucleophile. The procedure cleanly affords acylsilanes in good yields and circumvents the use of stoichiometric copper(I) cyanide typically employed to synthesize these compounds from acid chlorides.
1,1-Disilyl alcohols like 6 give the silylethers like 9 on treatment with base and alkyl halides, in a reaction which may be formulated as the alkylation of the Brook-rearranged carbanion 8. The products can be oxidised to give ketones like 10, showing that this Brook-rearranging system supplies a controlled d1 synthon of the acyl anion class. The alcohols can be prepared from the acid chloride 12
Regio‐ and Stereoselective Synthesis of Fully Substituted Silyl Enol Ethers of Ketones and Aldehydes in Acyclic Systems
作者:Peter‐Yong Wang、Guillaume Duret、Ilan Marek
DOI:10.1002/anie.201909089
日期:2019.10.14
The regio- and stereoselective preparation of fully substituted and stereodefined silylenolethers of ketones and aldehydes through an allyl-Brook rearrangement is reported. This fast and efficient method proceeds from a mixture of E and Z isomers of easily accessible starting materials.
α-Amino carbene or carbenoid formation in the reaction of a tertiary amide with PhMe2SiLi and its insertion into the Si–Li bond of a second equivalent
作者:Ian Fleming、Stephen R. Mack、Ian Fleming、Stephen R. Mack、Barry P. Clark
DOI:10.1039/a800650d
日期:——
PhMe2SiLi reacts with tertiary amides, RCONMe2, to give a carbene, RCNMe2, or an equivalent carbenoid, which gives enediamines, R(Me2N)CC(NMe2)R, in the absence of a strong nucleophile, but is attacked by strong nucleophiles, NuLi, to give lithium reagents R(Me2N)CLiNu.