Cascade reactions are an important strategy in reaction design, allowing streamlining of chemical synthesis. Here we report a cascade Suzuki–Miyaura/Diels–Alder reaction, employing vinyl Bpin as a bifunctional reagent in two distinct roles: as an organoboron nucleophile for cross-coupling and as a Diels–Alder dienophile. Merging these two reactionsenables a rapid and operationally simple synthesis
Nickel-Catalyzed Direct Synthesis of Aryl Olefins from Ketones and Organoboron Reagents under Neutral Conditions
作者:Chuanhu Lei、Yong Jie Yip、Jianrong Steve Zhou
DOI:10.1021/jacs.7b02742
日期:2017.5.3
Nickel-catalyzed addition of arylboron reagents to ketones results in aryl olefins directly. The neutral condition allows acidic protons of alcohols, phenols, and malonates to be present, and fragile structures are also tolerated.
Stereoselective [4+2]‐Cycloaddition with Chiral Alkenylboranes
作者:Dongshun Ni、Brittany P. Witherspoon、Hong Zhang、Chen Zhou、K. N. Houk、M. Kevin Brown
DOI:10.1002/anie.202000652
日期:2020.7.6
A method for the stereoselective [4+2]‐cycloaddition of alkenylboranes and dienes is presented. This transformation was accomplished through the introduction of a new strategy that involves the use of chiral N‐protonated alkenyl oxazaborolidines as dieneophiles. The reaction leads to the formation of products that can be readily derivatized to more complex structural motifs through stereospecific transformations
Cyclohexenol annulation via the alkoxy-accelerated rearrangement of vinylcyclobutanes
作者:Rick L. Danheiser、Carlos Martinez-Davila、Howard Sard
DOI:10.1016/s0040-4020(01)93268-5
日期:——
efficient method for the synthesis of 3-cyclohexenol derivatives. 2-Vinylcyclobutanones are prepared from α,β-unsaturated carbonyl compounds by the method of Trost and via [2 + 2]-cycloadditions of olefins and vinylketenes. Addition of hydride or alkyllithium reagents then generates 2-vinylcyclobutanol salts which directly rearrange to afford 3-cyclohexenols. The two methods constitute new [3 + 3]- and [4 +
Tuning of Vinylborane Dienophilicity. Optimization of Reactivity, Regioselectivity, endo-Stereoselectivity, and Reagent Stability
作者:Daniel A. Singleton、Jose P. Martinez、José V. Watson、Grace M. Ndip
DOI:10.1016/s0040-4020(01)90174-7
日期:1992.7
Diels-Alder reactions are compared. Vinyl-3,6-dimethylborepane was the most stable simple vinylborane examined, and appears to be indefinitely stable at 25°C. Surprisingly, trivinylborane is the most reactive, and reacts about 18 times faster than the vinyldialkylboranes with cyclopentadiene. Vinyl-9-BBN is the most regioselective dienophile, in keeping with principally steric control of regioselectivity