Organoboranes. 56. Systematic study of the reactions of 1-alkenylboronic esters with representative organolithium and Grignard reagents to provide an efficient, selective synthesis of organyl-1-alkenylborinic esters
作者:Herbert C. Brown、Nagarajan Vasumathi、Navalkishore N. Joshi
DOI:10.1021/om00028a021
日期:1993.4
A selective reaction of the ''ate'' complexes formed with 1-alkenylboronic esters and organolithium or Grignard reagents, by treatment with either Bronsted or Lewis acids at -78-degrees-C to give the corresponding organylalkenylborinic esters, is explored in this study. This systematic, detailed study reveals that the nature of the alkoxy group on boron, the nature and the amount of the alkyllithium or Grignard reagent used, the solvent, the reaction temperature, and the nature and amount of the acid used all play significant roles in influencing both the yield and the selectivity achieved for the formation of the desired organylalkenylborinates. Optimized procedures for the syntheses of representative organylalkenylborinic esters in high yield are summarized.
1,1′-Linked Cyclopropane Derivatives: The Helical Conformation of Quinquecyclopropanol
作者:Takuya Kurahashi、Sergei I. Kozhushkov、Heiko Schill、Kathrin Meindl、Stephan Rühl、Armin de Meijere
DOI:10.1002/anie.200702013
日期:2007.8.27
SREBNIK, MORRIS;COLE, THOMAS E.;RAMACHANDRAN, P. VEERARAGHAVAN BROWN HERB+, J. ORG. CHEM., 54,(1989) N6, C. 6085-6096
作者:SREBNIK, MORRIS、COLE, THOMAS E.、RAMACHANDRAN, P. VEERARAGHAVAN BROWN HERB+
DOI:——
日期:——
BROWN, H. C.;COLE, TH. E.;SREBNIK, M., ORGANOMETALLICS, 1985, 4, N 10, 1788-1792
作者:BROWN, H. C.、COLE, TH. E.、SREBNIK, M.
DOI:——
日期:——
BROWN H. C.; PARK WON SUH; CHA JIN SOON; CHO BYUNG TAE; BROWN CH. A., J. ORG. CHEM., 51,(1986) N 3, 337-342
作者:BROWN H. C.、 PARK WON SUH、 CHA JIN SOON、 CHO BYUNG TAE、 BROWN CH. A.