Aliphatic and aromatic aldehydes have been converted into 1,1-dibromoalkyl derivatives using a 1:1 mixture of triphenyl phosphite and bromine as reagent.
Copper-Catalyzed Double C(sp<sup>3</sup>)–Si Coupling of Geminal Dibromides: Ionic-to-Radical Switch in the Reaction Mechanism
作者:Hamideh Hazrati、Martin Oestreich
DOI:10.1021/acs.orglett.8b02281
日期:2018.9.7
A method for converting geminal dibromides into 1,1-disilylated alkanes is reported. The reaction is promoted by a copper(I) catalyst generated in situ from CuBr·SMe2 as a precatalyst and 4,4′-di-tert-butyl-2,2′-bipyridine (dtbpy) as a ligand. A Si–B reagent is used as the silicon pronucleophile. It is shown that the two C(sp3)–Si bond-forming events differ in mechanism, with the first being ionic
Brominative Deoxygenation of some aldehydes and ethers
作者:Ulrich Von Roman、Rudolf Knorr、Claudia Behringer、Jakob Ruhdorfer
DOI:10.1002/prac.19943360313
日期:——
Three aldehydes (4a-c) are transformed into 1,1-dibromides (6a-c) by 2,2,2-tribromo-2,2-dihydro-1,3,2-benzodioxaphosphole (2). This reagent (2) is also very active in the cleavage of ethers, its reactions may show some features of carbonium as well as Of S(N)2 character.
Garcia Martinez, A.; Herrera Fernandez, A.; Martinez Alvarez, R., Synthesis, 1986, # 12, p. 1076 - 1078