A practical and useful, catalyticenantioselective method has been developed for the synthesis of tertiary diaryl and aryl heteroaryl carbinols starting from commercially available aromatic ketones and aryl or heteroaryl bromides. In this method, organotitanium reagents are generated in situ from the bromides by lithiation with nBuLi followed by transmetallation of the resulting organolithiums with
已经开发了一种实用且有用的催化对映选择性方法,用于从可商购的芳族酮和芳基或杂芳基溴化物开始合成叔二芳基和芳基杂芳基甲醇。在该方法中,通过用n BuLi锂化从溴化物中原位生成有机钛试剂,然后用ClTi(O i Pr)3对所得的有机锂进行金属转移。在(R)-3-(3,5-双三氟甲基苯基)-1,1'-联-2-萘酚(BTFP-BINOL)以高对映选择性和高收率提供了相应的叔醇。反应也可以从呋喃和2-噻吩基锂开始。该方法操作简单,可在10 mmol规模下进行而没有任何困难。
Rhodium(I)/Diene-Catalyzed Addition Reactions of Arylborons with Ketones
作者:Yuan-Xi Liao、Chun-Hui Xing、Qiao-Sheng Hu
DOI:10.1021/ol300275s
日期:2012.3.16
Rh(I)/diene-catalyzed additionreactions of arylboroxines/arylboronic acids with unactivated ketones to form tertiary alcohols in good to excellent yields are described. By using C2-symmetric (3aR,6aR)-3,6-diaryl-1,3a,4,6a-tetrahydropentalenes as ligands, the asymmetric version of such an additionreaction, with up to 68% ee, was also realized.
描述了 Rh(I)/二烯催化的芳基环硼氧烷/芳基硼酸与未活化酮形成叔醇的加成反应,收率很好。通过使用C 2 -对称 (3a R ,6a R )-3,6-二芳基-1,3a,4,6a-四氢戊烯作为配体,这种加成反应的不对称形式,具有高达 68% ee,也实现了。
Zn(salen)-Catalyzed Enantioselective Phenyl Transfer to Aldehydes and Ketones with Organozinc Reagent
A chiral zinc complex of salen was found to be an efficient catalyst for the phenyl transfer of organozinc reagent to aromaticaldehydes and ketones. High enantioselectivities were obtained in reactions of both aromaticaldehydes and ketones (up to 97% and 92% ee, respectively).