A new synthesis of an α-haloalkaneboronic ester, 1-bromo-1-ethylenedioxyboryl-2-phenylethane, and a supervenient synthesis of a 1,2-diboronic ester. 1,2-bis(ethylenedioxyboryl)-1-phenylethane
作者:D.S. Matteson、Padipta K. Jesthi
DOI:10.1016/s0022-328x(00)87345-3
日期:1976.7
(I) to lithium bis(ethylenedioxyboryl)methide, Li HC(BO2C2H4)2 (II), with methyllithium, followed by alkylation with benzyl bromide, has yielded 1,1-bis(ethylenedioxyboryl)-2-phenylethane, PhCH2CH(BO2C2H2)4 (III). Reaction of III with one equivalent each of mercuric chloride and sodium methoxide in anhydrous methanol resulted in the selective replacement of one boron atom by mercury to form 1-chlo
三(ethylenedioxyboryl)甲烷的转化率,HC(BO 2 -C 2 H ^ 4)3(I)至锂双(ethylenedioxyboryl)甲基化物,锂HC(BO 2 ç 2 ħ 4)2(II)中,用甲基锂,接着用苄基溴烷基化,已经产生了1,1-双(ethylenedioxyboryl)-2-苯基乙烷,物理信道2 CH(BO 2 ç 2 ħ 2)4(III)。用一当量的每个的氯化汞和在无水甲醇中的甲醇钠III的反应导致了选择性取代通过水银一个硼原子的,以形成1-氯汞-1- ethylenedioxyboryl -2-苯基乙烷(IV),它与溴在二氯甲烷中反应以得到1-溴-1- ethylenedioxyboryl -2-苯基乙烷,物理信道2 CHBrBO 2 c ^ 2 ^ h 4(V)。几次试图转换V到一个氨基硼酸均告失败。为了找到更方便的III路线,苯乙炔与硼烷在四氢呋喃中进行二