to excellent yields with high levels of stereoselectivity. Useful C3-unit elongation, which makes the best use of an allylether as a protecting group and a nucleophilic allylation agent, is demonstrated. Mechanisms for the umpolung reaction (of an allylether into an allylic anion) and stereoselectivity associated with allylation of aldehydes are discussed.
Indium Trichloride-Catalyzed Indium-Mediated Allylation of Dihydropyrans and Dihydrofurans in Water
作者:Shen Qi、Teck-Peng Loh、Song Juan、Zhi-Hao Hua、Shun-Jun Ji
DOI:10.1055/s-2004-820030
日期:——
A one-pot indium trichloride-catalyzed indium-mediated allylation of dihydropyrans and dihyfrofurans has been found to be feasible. This catalytic system afforded the allylated diols in moderate to high yields.
Treatment of tetrahydropyranyl (or tetrahydrofuranyl) ether of allylic alcohol with tributylmanganate provided 7-octene-1,5-diol (or 6-hepten-1,4-diol) in good yields. The reaction of propargylic tetrahydropyranyl ether with tributylmanganate is also described.
α,ω-Dienes in Cp2TiCl2-catalyzed synthesis of boriranes
作者:Liliya I. Khusainova、Leila O. Khafizova、Tatyana V. Tyumkina、Rustam R. Salakhutdinov、Usein M. Dzhemilev
DOI:10.1016/j.jorganchem.2021.121981
日期:2021.10
The Cp2TiCl2-catalyzed cycloboration of α,ω-dienes with boron halides BX3 (X = F and Cl) or RBCl2 (R = Et and n-Pent) in the presence of metallic Mg to obtain 1,2-disubstituted boriranes is reported. The α,ω-dichloroborane reacts with α-olefins under the same reaction conditions to form mono-boriranes linked by a hydrocarbon chain with oxaborinane ring.