An experimental and theoretical study on stereoselective addition to 3-formyl-Δ2-isoxazolines. Part 1. 1,3-anti-selectivity induced by BF3·OEt2
作者:Akio Kamimura、Akikazu Kakehi、Kenzi Hori
DOI:10.1016/s0040-4020(01)87239-2
日期:1993.8
Experimental and theoretical investigations of the anti-selective nucleophilic addition induced by BF3 to 3-formyl-Δ2-isoxazolines are described. Abinitiomolecularorbital (MO) calculations show that the 3-formyl-Δ2-isoxazoline-BF3 complex prefers s-trans conformation to s-cis conformation. Nucleophiles attack the stable s-trans conformer from the opposite side of C(4) substituent, giving anti-adducts