Reaction of diazoalkanes with unsaturated compounds. 9 Catalyzed cyclomethylenation of trimethylsilylacetylenes by diazomethane
作者:Yu. V. Tomilov、A. B. Kostitsyn、E. V. Shulishov、O. M. Nefedov
DOI:10.1007/bf00961707
日期:1990.5
The catalyzed reaction of methyl-, propyl-, and cyclopropyltrimethylsilylacetylenes with diazomethane in the presence of CuCl leads to the corresponding cyclopropenes and bicyclobutanes with overall yields of up to 70%, and also to the products of incorporation of a methylene group into the C3-H bond of the cyclopropenes formed (2-9%). Partial catalyzed isomerization of the 1-trimethylsilyl-2-cyclopropylcyclopropene formed from trimethylsilylcyclopropylacetylene, into 1-trimethylsilyl-1-cyclopropylallene (yield approximately 50%) was discovered to proceed under the reaction conditions.
Room-Temperature Synthesis of Trisubstituted Allenylsilanes via Regioselective C–H Functionalization
作者:Rong Zeng、Shangze Wu、Chunling Fu、Shengming Ma
DOI:10.1021/ja409861s
日期:2013.12.11
A Rh(III)-catalyzed o-C-H bond functionalization-based allenylation reaction of allenylsilanes 2 with N-methoxybenzamides 1 affords poly-substituted allenylsilanes with a wide range of attractive functional groups in moderate to excellent yields under very mild conditions (20 degrees C, compatible with ambient air and moisture). Those products may be transformed to different products with attractive structural features. Careful mechanistic studies suggest the reaction proceeds via o-rhodation, regioselective insertion, and beta-H elimination.