Diastereoselective Allylation and Crotylation Reactions of Aldehydes with Potassium Allyl- and Crotyltrifluoroborates under Lewis Acid Catalysis
作者:Robert A. Batey、Avinash N. Thadani、David V. Smil、Alan J. Lough
DOI:10.1055/s-2000-6303
日期:——
Potassium allyl- and crotyltrifluoroborates react with aldehydes in a process catalyzed by a variety of Lewis acids, to give the corresponding homoallylic alcohols. Of the Lewis acids examined, BF3 · OEt2, used either stoichiometrically or catalytically, was found to most efficiently catalyze this reaction. The air and moisture stable potassium organotrifluoroborate salts react with a variety of alkyl, α- or β-substituted alkyl, and aryl aldehydes, and lead to the adducts in high yield and with high diastereoselectivity.
Potassium allyl- and crotyltrifluoroborates: Stable and efficient agents for allylation and crotylation
作者:Robert A. Batey、Avinash N. Thadani、David V. Smil
DOI:10.1016/s0040-4039(99)00774-1
日期:1999.6
Potassium allyl- and crotyltrifluoroborates react rapidly with aldehydes in the presence of BF3·Et2O. These salts are stable to air and moisture, and lead to adducts in high yield and with high diastereoselectivity. The stereochemistry of the crotylated products is consistent with the reaction via allylboron difluoride and a Zimmerman-Traxler like transition state.
A Grignard-Type Addition of Allyl Unit to Aldehydes by Using Bismuth and Bismuth Salt
作者:Makoto Wada、Hidenori Ohki、Kin-ya Akiba
DOI:10.1246/bcsj.63.1738
日期:1990.6
In the presence of metallic bismuth, bismuth(III) chloride–metallic zinc, or bismuth(III) chloride–metallic iron, allylic halides have been found to react with aldehydes under mild conditions to give the corresponding homoallylic alcohols in high yields with high chemo-, regio-, and stereoselectivity. Allylic halides have been also found to react with aldehydes at room temperature in tetrahydrofuran–water
Carbon—carbon bond formation with bismuth salt. A chemoselective Grignard-type addition of allyl unit to aldehydes
作者:Makoto Wada、Hidenori Ohki、Kin-ya Akiba
DOI:10.1016/s0040-4039(00)85061-3
日期:1986.1
In the presence of bismuth(III) chloride—metallic zinc or bismuth(III) chloride—metallic iron, allylic halides were found to react with aldehydes under mild conditions to give the corresponding homoallylic alcohols in high yields with high chemoselectivity.
Studies on the Allylation Reactions of Aldehydes and Ketones with Lanthanum in Water
作者:Yan‐Jiang Bian、Jian‐Qiang Zhang、Jin‐Ping Xia、Ji‐Tai Li
DOI:10.1080/00397910600781232
日期:2006.8.1
Abstract The allylation reactions of aldehydes and ketones were carried out in 25%–98% (or 29%–96%) yield with La/SnCl2/H2O under ultrasound irradiation (or stirring) at rt for 1 h (or 4 h). The main advantage of the present procedure is the higher yield and the environmentally benign method.