Enantioselective Synthesis of Biaryl Compounds via Suzuki–Miyaura Cross-Coupling Using a Palladium Complex of 7′-Butoxy-7-(diphenylphosphino)-8,8′-biquinolyl: Investigation of a New Chiral Ligand Architecture
作者:Paul Blakemore、Zhenhua Wu、Chao Wang、Lev Zakharov
DOI:10.1055/s-0033-1340519
日期:——
effective for the synthesis of hindered 2,2′-disubstituted 1,1′-binaphthyls (78–83% yield, 20–38% ee). 7,7′-Dihydroxy-8,8′-biquinolyl was converted to the title phosphine in four-steps via Mitsunobu monoetherification, trifylation, phosphination, and phosphine oxide reduction (63% overall yield). Enantiomerically pure phosphine was combined with Pd2dba3 and investigated for the synthesis of axially chiral
摘要 通过Mitsunobu单醚化,玻璃化,磷酸化和氧化膦还原反应,将7,7'-二羟基-8,8'-联喹啉基通过四个步骤转化为标题膦(总收率63%)。将对映体纯的膦与Pd 2 dba 3结合,并研究在K 3 PO 4存在下由Ar 1 Br和Ar 2 B(OH)2合成轴向手性联芳基化合物在甲苯溶剂中溶解(6个实例,产率4–97%,ee 4–74%)。为了比较目的,研究了类似的碳环配体2-(二苯基膦基)-2'-甲氧基-1,1'-联萘基(MOP),发现该化合物对合成受阻的2,2'-二取代的1,1'-有效双萘基(收率78-83%,ee 20-38%)。 通过Mitsunobu单醚化,玻璃化,磷酸化和氧化膦还原反应,将7,7'-二羟基-8,8'-联喹啉基通过四个步骤转化为标题膦(总收率63%)。将对映体纯的膦与Pd 2 dba 3结合,并研究在K 3 PO 4存在下由Ar 1 Br和Ar 2 B(OH