The reaction of trialkylvinylborates with aldehydes as applied to syntheses of 1,3-alkanediols, 1-chloro-3-heptanol and a cyclopropane derivative
作者:K. Utimoto、K. Uchida、H. Nozaki
DOI:10.1016/0040-4020(77)80382-7
日期:1977.1
R2BCHR-CH2-CH(OLi)R' (2) or its borate form (3). Oxidation of the adducts with alkaline hydrogen peroxide gives ca. 1:1 mixture of diastereomeric 1,3-alkanediols in good yields. On the other hand, the reaction of BrMg[R3BCHCH2] with R'CHO affords less satisfactory results. Successive treatment of 2 (R = n-Bu, R' = H) with PCl5 and alkaline H2O2 gives HOCHBu-CH2-CH2Cl (6). Treatment of Et2BCHEt-CH2-CHCl-Ph
用Li [R 3 BCH = CH 2 ]处理R'CHO得到加合物,其被认为是R 2 BCHR-CH 2 -CH(OLi)R'(2)或其硼酸盐形式(3)。用碱性过氧化氢对加合物进行氧化可得到大约。非对映异构体1,3-链烷二醇的1:1混合物,收率高。另一方面,BrMg [R 3 BCH = CH 2 ]与R'CHO的反应不能令人满意。用PCl 5和碱性H 2 O 2连续处理2(R = n-Bu,R'= H),得到HOCHBu-CH 2 -CH 2 Cl(6)。用NaOH水溶液处理Et 2 BCHEt-CH 2 -CHCl-Ph产生1-乙基-2-苯基环丙烷7。