tris(pentafluorophenyl)borane, B(C6F5)3, and BF3·Et2O are shown to catalyze the regioselective hydrothiolation of a wide range of terminal 1-aryl-1,3-dienes. In the case of internal 1,3-dienes, B(C6F5)3 is by far the better catalyst than BF3·Et2O. The process features mild reaction conditions, broad scope, and low catalyst loading, and it can be scaled up quickly over a short reaction time. The reactions are rate-limited
报道了用于合成仲和叔烯丙基硫醚的无过渡金属的1,3-二烯氢硫醇化反应。硼路易斯酸三(五氟苯基)硼烷,B(C 6 F 5)3和BF 3 ·Et 2 O已显示出催化范围广泛的末端1-芳基-1,3-二烯的区域选择性氢硫醇化反应。在内部1,3-二烯的情况下,与BF 3 ·Et 2相比,B(C 6 F 5)3是更好的催化剂。O.该工艺的特点是反应条件温和,适用范围广,催化剂用量低,并且可以在较短的反应时间内迅速扩大规模。如高水平DFT计算所示,反应是通过1,3-二烯与硫醇-硼路易斯酸配合物的1-芳基定向质子化,然后将硫化物阴离子转移到所得的烯丙基阳离子上来进行的,从而限制了反应的速率。
Boron-Catalyzed Hydroarylation of 1,3-Dienes with Arylamines
Catalytic hydroarylation reactions of conjugated dienes are achieved using tris(pentafluorophenyl)borane as a Lewis acid catalyst under mild reaction conditions. This new protocol shows a broad substrate scope for the highly regioselective functionalization of sterically hindered aniline derivatives. Experimental and extensive density functional theory mechanisticstudies show that the complex of residual
共轭二烯的催化加氢芳基化反应是在温和的反应条件下使用三(五氟苯基)硼烷作为路易斯酸催化剂实现的。这个新协议显示了空间位阻苯胺衍生物的高度区域选择性功能化的广泛底物范围。实验和广泛的密度泛函理论机理研究表明,残留水和 B(C 6 F 5 ) 3的络合物在共轭二烯的芳基辅助质子化中起着至关重要的作用,形成烯丙基阳离子中间体,诱导芳烃的亲电芳香取代。苯胺底物。
Michailow; Powarow, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1959, p. 1948,1951;engl.Ausg.S.1859,1862
作者:Michailow、Powarow
DOI:——
日期:——
Dombrovskii,A.V.; Ganushchak,N.I., Journal of general chemistry of the USSR, 1961, vol. 31, p. 1774 - 1778