Selective bromochlorination of a homoallylic alcohol for the total synthesis of (−)-anverene
作者:Frederick J Seidl、Noah Z Burns
DOI:10.3762/bjoc.12.129
日期:——
a recently reported method for the catalytic enantioselective bromochlorination of allylic alcohols is expanded to include a specific homoallylicalcohol. Critical factors for optimization of this reaction are highlighted. The utility of the product bromochloride is demonstrated by the first total synthesis of an antibacterial polyhalogenated monoterpene, (-)-anverene.
Regioselectivity of bromofluorination of functionalized 1-alkenes
作者:Martin Lübke、Rolf Skupin、Günter Haufe
DOI:10.1016/s0022-1139(99)00230-4
日期:2000.3
position to the double bond destabilize carbenium centers in 2-position. Consequently, the part of anti-Markovnikov-oriented bromofluorides increases. Besides, with dropping reactivity of alkenes, the formation of dibromides becomes a competitive side reaction of bromofluorination. The extent of this process depends on the nature of the amine/HF reagent. This reaction is most important in case of the more
Bromination of alkenols with the H2O2—LiBr—CeIII and H2O2—LiBr—CeIV systems
作者:G. I. Nikishin、L. L. Sokova、N. I. Kapustina
DOI:10.1007/s11172-012-0064-z
日期:2012.2
Reactions of alkenols with H2O2—LiBr—Ce(NO3)3·6H2O or H2O2—LiBr—Ce(NH4)2(NO3)6 system led to bromination of the double bond to yield vicinal dibromoalkanols. The reaction proceeded highly selectively, no oxidation of the hydroxyl group virtually occurred.