Regioselective 1,4-Conjugate Addition of Grignard Reagents to Nitrodienes in the Presence of Catalytic Amounts of Zn(II) Salts
作者:Ramesh C. Dhakal、R. Karl Dieter
DOI:10.1021/ol500114m
日期:2014.3.7
Grignard reagents undergo facile regioselective 1,4-conjugate addition to nitrodienes in the presence of catalytic amounts of Zn(II) salts with excellent yields. A wide range of ligands such as alkyl, aryl, heteroaryl, allyl, vinyl, 1-alkynyl, and alkoxy ligands were transferred, while a thiolate ligand afforded 1,6-regioselectivity. The reactions were successfully carried out on δ-alkyl- or aryl-substituted
在催化量的Zn(II)盐存在下,格氏试剂可轻松地向硝基二烯进行区域选择性的1,4-共轭加成反应,且收率极高。转移了各种配体,例如烷基,芳基,杂芳基,烯丙基,乙烯基,1-炔基和烷氧基配体,而硫醇盐配体提供了1,6-区域选择性。反应在δ-烷基或芳基取代的α,β,γ,δ-二不饱和硝基二烯底物上成功进行。区域选择性受温度或溶剂选择的影响最小。