Synthesis of 1,4-disubstituted (E,Z)-1,3-dienes from lithium dicyclohexyl(trans-1-alkenyl)(1-alkynyl)borates
作者:George Zweifel、Stephen J. Backlund
DOI:10.1016/s0022-328x(00)84873-1
日期:1978.8
Treatment of lithium dicyclohexyl(trans-1-alkenyl)(1-alkynyl)borates with either boron trifluoride etherate or tri-n-butyltin chloride results in the preferential migration of the alkenyl group from boron to the adjacent alkynyl carbon atom. Protonolysis of the resultant organoboron intermediates with acetic acid affords the corresponding 1,4-disubstituted (E,Z)-1,3-dienes in good yields, provided
Organic synthesis using haloboration reaction. Part 9. A direct and selective synthesis of (Z,Z)-1-bromo-1,3-dienes and (E,Z)-1,3-dienes by the hydroboration-bromoboration sequence of two alkynes
1-Alkenyldibromoboranes readily obtainable by the hydroboration of first alkynes with dibromoborane-dimethylsulfide followed by treatment with tribromoborane, react without any difficulty with second 1-alkynes as bromoborating agents to give (1-a1keny1)(2-bromo-1-alkeny)- bromoboranes (5). The reaction of 5 with iodine in the presence of potassium acetate provides (Z,Z)-1-bromo-1,3-dienes (6), specifically
Stereo- and regiospecific syntheses to provide conjugated (E,Z)- and (Z,Z)-alkadienes, and arylated (Z)-alkenes in excellent yields via the palladium-catalyzed cross-coupling reactions of (Z)-1-alkenylboronates with 1-bromoalkenes and aryl iodides
作者:Norio Miyaura、Makoto Satoh、Akira Suzuki
DOI:10.1016/s0040-4039(00)83869-1
日期:1986.1
SUZUKI, AKIRA;HARA, SHOJI, J. SYNTH. ORG. CHEM., JAP., 1985, 43, N 2, 100-111