Modular Bis(oxazoline) Ligands for Palladium Catalyzed Allylic Alkylation: Unprecedented Conformational Behaviour of a Bis(oxazoline) Palladium 3-1,3-Diphenylallyl Complex
作者:Miquel Angel Pericàs、Cristina Puigjaner、Antoni Riera、Anton Vidal-Ferran、Montserrat Gómez、Francisco Jiménez、Guillermo Muller、Mercè Rocamora
DOI:10.1002/1521-3765(20020916)8:18<4164::aid-chem4164>3.0.co;2-g
日期:2002.9.16
5-cis (6 c) stereochemistry at the individual rings have been prepared in high yield. Their eta(3)-allyl palladium complexes (8 a-g, 9 c and 10) have been used as catalytic precursors in allylic alkylation reactions with excellent enantioselectivities (up to 96 %) for the trans oxazoline derivatives, while Pd/6 c system was inactive. NMR studies on palladium eta(3)-1,3-diphenylallyl intermediates (11
高产率地制备了在各个环上具有4,5-反式(5 ag)或4,5-顺式(6 c)立体化学的新对映体双(恶唑啉)家族。他们的eta(3)-烯丙基钯配合物(8 ag,9 c和10)已被用作烯丙基烷基化反应的催化前体,对恶唑啉衍生物具有出色的对映选择性(最高96%),而Pd / 6 c体系为不活跃。对钯eta(3)-1,3-二苯基烯丙基中间体(11a,c和e)的NMR研究表明,溶液中存在syn / syn-和syn / anti-烯丙基异构体。这类似于包含衍生自丙二酸的双(恶唑啉)的Pd烯丙基络合物中eta(3)-eta(1)-eta(3)异构的第一个例子。