Highly Enantioselective Transfer Hydrogenation of Polar Double Bonds by Macrocyclic Iron(II)/(NH)<sub>2</sub>P<sub>2</sub> Catalysts
作者:Raphael Bigler、Antonio Mezzetti
DOI:10.1021/acs.oprd.5b00391
日期:2016.2.19
We describe herein a new protocol for the synthesis of 2,2′-((1S,1′S)-ethane-1,2-diylbis(phenylphosphanediyl))dibenzaldehyde ((SP,SP)-5), which is the key intermediate in the synthesis of macrocyclic iron(II)/(NH)2P2 catalysts for the highly enantioselective transfer hydrogenation of polar double bonds. The dialdehyde (SP,SP)-5 was obtained as a single diastereoisomer and enantiomer from an optically
我们在本文中描述了合成2,2'-(((1 S,1 'S)-乙烷-1,2-二基双(苯基膦二基))二苯甲醛((S P,S P)-5)的新方案,是合成大环铁(II)/(NH)2 P 2催化剂的关键中间体,用于极性双键的高度对映选择性转移氢化。二醛(S P,S P)-5是由光学纯H制成的单一非对映异构体和对映体。-亚膦酸酯在五个步骤中的产率为33%。将其进一步转化以提供数克量的大环铁(II)/(NH)2 P 2配合物,该配合物在芳基烷基酮和亚胺在2-丙醇中的不对称转移氢化中以100 mmol的规模进行了测试。十种底物,包括具有挑战性的底物(如叔丁基苯基酮)和与工业相关的分子(如3,5-双(三氟甲基)苯乙酮),均降低了高收率(89.0–99.7%),出色的对映选择性(95.8–99.4%ee) ,并且催化剂用量低(S / C高达10000/1)。