Bidentate ligand 8-aminoquinoline-aided Pd-catalyzed diastereoselective β-arylation of the prochiral secondary sp3 C–H bonds of 2-phenylbutanamides and related aliphatic carboxamides
作者:Bojan Gopalakrishnan、Srinivasarao Arulananda Babu、Rayavarapu Padmavathi
DOI:10.1016/j.tet.2015.08.049
日期:2015.10
two prochiral centers with aryl iodides successfully furnished the bis arylated products meso-8eA–hA and (±)-8eB–hB (diastereomers). The arylation of (S)-2-phenylbutanamide also gave the corresponding enantiomerically enriched compounds 10a–c (anti isomers). The stereochemistry of the products (±)-3a–l (major isomers), meso-8eA–hA (major isomers), (±)-8eB–hB (minor isomers) and enantiomerically enriched
在Pd催化的8-氨基喹啉辅助非对映选择性的前手性2°SP的β-芳基化调查3被报告具有在α-或γ位的取代基各种脂肪族羧酰胺的C-H键。2°SP的Pd催化的β芳基化3外消旋2- phenylbutanamides与芳基碘化物的C-H键,得到芳化产物(±)-3a -升(反异构体)与中度至良好非对映选择性(DR高达86 :14)。其次,各种γ-取代的脂肪族羧酰胺与芳基碘化物的Pd催化β-芳基化反应提供了相应的CH-H芳基化产物,其非对映选择性差。然后,将C的芳基化(β)的2-乙基-H键Ñ- (喹啉-8-基)丁酰胺具有与芳基碘化物2个的前手性中心成功地提供的二芳基化产物的内消旋- 8EA - HA和(±) - 8EB -为hB(非对映体)。的芳基化(小号)-2-苯基丁酰胺也得到相应的对映异构体富集的化合物10a到10c(反异构体)。产物的立体化学的(±)-3a -升(主要异构体),内消旋- 8EA -