Titanocene(II)-promoted olefination of various carbonyl compounds using 1,1-bis(phenylthio)-2-triorganosilylethanes gave allylsilanes in good yields. γ-Alkoxy and alkylthio group substituted allylsilanes were also obtained by using carboxylic esters and thiolesters, respectively.
Double metal-catalyzed cross-coupling reactions of alkenyl sulfoximines with diorganozinc reagents: Synthesis of optically active axial chiral allylic silanes
作者:Hans-Joachim Gais、Gred Bülow
DOI:10.1016/s0040-4039(00)93968-6
日期:1992.1
Nickel- and magnesium-catalyzed cross-couplingreaction of the alkenyl sulfoximine 5 with the pure diorganozinc reagents 6a and 6b gave the optically active allylic silanes 7a and 7b, respectively, Single metal catalysis was sufficient for the substitution of the bromide rac-9 whereas the sulfone rac-10 did neither under the conditions of single nor under that of double metal catalysis react with 6a
Preparation of 2-trimethylsilylmethyl-1-alkene; cross-coupling and protodesilylation sequence from 1,1-dibromo-1-alkene
作者:Jun’ichi Uenishi、Takuya Iwamoto、Masashi Ohmi
DOI:10.1016/j.tetlet.2006.12.044
日期:2007.2
A new method for the preparation of exomethylene type allylsilane is described. Selective mono-protodesilylation of 1-trimethylsityl-2-trimethylsilylmethyl-2-alkenes 2 with PPTS afforded 2-trimethylsilylmethyl-l-alkeiles 4 in excellent yields. Since the resulting allylsilanes 4 possess an exomethylene unit, the reactions of 4 with carbonyl compounds in the presence of Lewis acids gave the corresponding product 7 having an exomethylene unit in excellent yields. (c) 2007 Elsevier Ltd. All rights reserved.