Alkene-1,1-diboronic esters from the condensation of triborylmethide anions with ketones or aldehydes
作者:D.S. Matteson、P.B. Tripathy
DOI:10.1016/s0022-328x(00)92985-1
日期:1974.4
C[B(OMe)2]4, or the pinacol ester, C(BO2C2Me4)4, condense readily with ketones, R′2CO, to form alkene-1,1-diboronic esters, R′2CC[B(OR)2]2. The reaction is a general one and tolerates other functional groups, including α-chloro, carbethoxy, and tertiary amino substituents. Acetaldehyde and benzaldehyde also undergo the condensation. The alkene-1,1-diboronic esters are potentially useful synthetic intermediates
的triborylmethide离子,[(RO)2 B] 3 Ç - ,从甲基锂与methanetetraboronic酸的甲基酯,C [B(OME)的反应2 ] 4,或频哪醇酯,C(BO 2 ç 2我4)4,冷凝很容易地用酮,R' 2 CO,以形成烯烃-1,1-二硼酸的酯,R' 2 CC[B(OR)2 ] 2。该反应是一般反应,并且可以耐受其他官能团,包括α-氯,乙氧基和叔氨基取代基。乙醛和苯甲醛也发生缩合。烯烃-1,1-二硼酸酯是潜在有用的合成中间体。它们的反应包括通过过氧化氢转化为羧酸,通过溴转化为α-溴代烯烃硼酸酯,以及通过氯化汞和乙酸钠转化为烯基-1,1-二汞氯化物。