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.
Zinc-catalyzed synthesis of acylsilanes using carboxylicacids and a silylborane has been achieved in the presence of pivalic anhydride. Various carboxylicacids were converted to the corresponding acylsilanes. The in situ formation of mixed anhydrides was essential in the present reaction.
Aromatic acylsilanes such as benzoyltrimethylsilane react with ytterbium metal to give symmetrical 1,2-diarylacetylenes in good yields. Aliphatic acylsilanes are reduced with lanthanoid reagents such as Yb metal and SmI2 to afford α-silylalcohols.
Catalytic Multicomponent Synthesis of Highly Substituted Pyrroles Utilizing a One-Pot Sila-Stetter/Paal−Knorr Strategy
作者:Ashwin R. Bharadwaj、Karl A. Scheidt
DOI:10.1021/ol049044t
日期:2004.7.1
[reaction: see text] A multicomponent synthesis of highly substituted pyrroles catalyzed by thiazolium salts has been disclosed. The reaction employs an acyl anion conjugateaddition reaction of acylsilanes (sila-Stetter) and unsaturated ketones to generate 1,4-dicarbonyl compounds in situ. The subsequent addition of various amines promotes a Paal-Knorr reaction, affording the desired pyrrole nucleus