Anomalous threo-diastereoselectivity in allylic silane- or stannane–aldehyde condensation reactions: new interpretation of the antiperiplanar vs. synclinal problem on the transition-state conformations
Unusual threo-diastereoselectivity has been observed in the intermolecular reactions of β-substituted crotyl-silane or-stannane with 2-benzyloxypropanal under chelation conditions, which implies preference for the synclinal over the antiperiplanar transition state.
Chiral synthesis via organoboranes. 21. Allyl- and crotylboration of .alpha.-chiral aldehydes with diisopinocampheylboron as the chiral auxiliary
作者:Herbert C. Brown、Krishna S. Bhat、Ramnarayan S. Randad
DOI:10.1021/jo00268a017
日期:1989.3
On the Relative Reactivities of Allyl, Crotyl, α-Oxygenated Crotyl, γ-Oxygenated α-Methylallyl, and Allenyl Tri-<i>n</i>-butylstannane Reagents in Lewis Acid Promoted Additions to Aldehydes
作者:James A. Marshall、Jill A. Jablonowski、Gregory S. Welmaker