The influence of functional groups in R1 on the course of the organoboration reaction of alkynylstannanes 1, Me3SnCCR1 (R1 = OEt (a), 3-Methoxyphenyl (b), 2-Pyridyl (c)) has been studied. The reaction of 1 with triethylborane (2) yields the products (4), with the stannyl and boryl groups always in the cis-position. In the case of the reaction between 2 and 1c it has been observed for the first time
官能团R中的影响1对alkynylstannanes的organoboration反应过程1中,Me 3 SnCCR 1(R 1 = OET(一),3-
甲氧基苯基(b),2-
吡啶基(C ^))一直研究过。的反应1用三乙基
硼烷(2)得到的产品(4),与总是甲
锡和氧
硼基团在顺式-位。如果反应在2和1c之间首次观察到有机
硼化之后,
锡和
硼原子之间发生了Me / Et交换(4d)。描述了一种可能的机制。
炔烃1c与β-烷基-9-borabicyclo [3.3.1]
壬烷3(烷基= Me(a),Et(b),i-Pr(c))立体选择性反应,得到化合物5a,b ,c,其中双环系统已经被一个碳原子扩大,而
苯乙烯基和
硼基保持在顺式位置。1 H,11 B,13 C,119SnN MR光谱学和分析数据支持化合物4和6的拟议结构。