Highly Selective Reaction of α-Halo-α,β-unsaturated Esters with Ketones or Aldehydes Promoted by SmI<sub>2</sub>: An Efficient Alternative Access to Baylis−Hillman Adducts
作者:José M. Concellón、Mónica Huerta
DOI:10.1021/jo0504969
日期:2005.6.1
A samarium diiodide promoted addition of aromatic or aliphatic β-substituted-α-halo-α,β-unsaturated esters 1 or 3 to both ketones (in THF) and aldehydes (in acetonitrile) led to (Z)-2-(1-hydroxyalkyl)-2,3-alkenoates 2 and 4 in good yields and very high stereoselectivity. This method constitutes an efficient and valuable alternative to the synthesis of Baylis−Hillman adducts. A mechanism is proposed
二碘化sa促进芳香族或脂肪族β-取代-α-卤代-α,β-不饱和酯1或3加到酮(在THF中)和醛(在乙腈中)上,导致(Z)-2-(1-羟基烷基)-2,3-链烯酸酯2和4的收率和立体选择性很高。该方法构成了Baylis-Hillman加合物合成的有效且有价值的替代方法。提出了一种机制来解释这种转变。