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。
A general palladium-catalyzed cross-coupling of aryl fluorides and organotitanium (IV) reagents
作者:Xiao-Yun He
DOI:10.1007/s00706-021-02796-6
日期:2021.7
Pd(OAc)2/1-[2-(di-tert-butylphosphanyl)phenyl]-4-methoxy-piperidine was demonstrated to effectively catalyze cross-coupling of aryl fluoride and aryl(alkyl) titanium reagent. Both electron-deficient and electron-rich aryl fluoride can react effectively with nucleophile and provide extensive functional groups tolerance. 2-Arylated product was realized by selective activation of the C–F bond. Graphic
Highly efficient synthesis of 1,2-disubstituted acetylenes derivatives from the cross-coupling reactions of 1-bromoalkynes with organotitanium reagents
作者:Chuan Wu、Qing-Han Li
DOI:10.1016/j.tet.2021.132370
日期:2021.9
A Highly efficient route for the synthesis of 1,2-disubstituted acetylene derivatives has been developed by nickel catalyzed cross-couplings of alkynyl halides with aryl titanium reagents under mild conditions. This has given corresponding cross-coupling products good to excellent isolated yields of up to 92 %. The aryls bearing electron-donating or electron-withdrawing groups in either alkynylhalides
catalytic coupling reaction of propargyl halides with organotitanium reagents is reported. The reaction of propargyl bromide with organo-titanium reagents mediated by NiCl2 (2 mol%) and PCy3 (4 mol%) in CH2Cl2 afforded coupling product allenes in good to excellent yields (up to 95%) at room temperature. However, NiCl2(PPh3)2 was the best catalyst for substituted propargyl halides to yield allenes or
Iron-catalyzed oxidative biaryl cross-couplings <i>via</i> mixed diaryl titanates: significant influence of the order of combining aryl Grignard reagents with titanate
作者:Kun Ming Liu、Juan Wei、Xin Fang Duan
DOI:10.1039/c5cc00514k
日期:——
The mixed diaryl titanates were used for the first time to modify the reactivity of two aryl Grignardreagents. Two titanate intermediates, Ar[Ar'Ti(OR)3]MgX and Ar'[ArTi(OR)3]MgX, formed via alternating the sequence of combining Grignardreagents with ClTi(OR)3 showed a significant reactivity difference. Taking advantage of such different reactivity, two highly structurally similar aryl groups could
Enantioselective addition of ArTi(O<sup>i</sup>Pr)<sub>3</sub> to aldehydes catalyzed by a titanium complex of an N-sulfonylated amino alcohol
作者:Shih-Ju Chang、Shuangliu Zhou、Han-Mou Gau
DOI:10.1039/c4ra14173c
日期:——
additions of ArTi(OiPr)3 to aldehydescatalyzed by a titaniumcatalyst of N-sulfonylated aminoalcohols were reported, and results showed that the chiral N-sulfonylated aminoalcohol with two stereogenic centers could catalyze the asymmetric addition of ArTi(OiPr)3 to aldehydes to afford desired secondary alcohols in good yields with good to excellent enantioselectivities of up to 95% ee.
报道了N-磺酰化氨基醇的钛催化剂催化醛基上不对称地添加ArTi(O i Pr)3,结果表明具有两个立体中心的手性N-磺酰化氨基醇可以催化ArTi(O)的不对称加成。i Pr)3-醛,以高收率提供所需的仲醇,并具有高达95%ee的良好至优异的对映选择性。