Synthesis of 2-substituted indolines using sequential Pd-catalyzed processesElectronic supplementary information (ESI) available: 1H and 13C NMR spectra for all products without elemental analysis data (3c–g and 4d–g). See http://www.rsc.org/suppdata/p1/b2/b200163b/
作者:Hervé J. C. Deboves、Christopher Hunter、Richard F. W. Jackson
DOI:10.1039/b200163b
日期:2002.3.8
A concise route to enantiomerically pure 2-substituted indolines 4a–g and a 2-substituted tetrahydroquinoline 4h has been developed by application of the Pd-catalyzed coupling of amino functionalised organozinc reagents with 2-bromoiodobenzene, followed by Buchwald's palladium-catalyzed intramolecular amination reaction. The yields in the initial coupling are modest (36–52%), but the cyclisation yields are satisfactory (63–87%). The stereochemical integrity of a representative example was established by chiral phase HPLC.
通过钯催化氨基官能化有机锌试剂与 2-溴碘苯偶联,然后进行布赫瓦尔德钯催化分子内胺化反应,开发出了一条制备对映体纯度为 2-取代吲哚类化合物 4a-g 和 2-取代四氢喹啉 4h 的简便路线。初始偶联的收率不高(36-52%),但环化收率令人满意(63-87%)。通过手性相高效液相色谱法确定了一个代表性实例的立体化学完整性。