New series of functional bicyclic organogermanium compounds

Et3B-mediated and palladium-catalyzed direct allylation of β-dicarbonyl compounds with Morita–Baylis–Hillman alcohols

“…However, the poor ability of the hydroxy moiety, as a leaving group, has limited the use of the allyl alcohols as substrates. Correlatively, some efforts have been made in this direction by the use of transition metals such as copper [6], nickel [7], ruthenium (I, II) [8], and palladium (0, II) [9–10] as the catalyst or by converting the allylic alcohols into esters of inorganic acids, e.g., As 2 O 3 [11], B 2 O 3 [12], CO 2 [13–14] . More recently the Lewis acids, such as, Ti(OiPr ) 4 [15], BEt 3 [16–19], BPh 3 [20], SnCl 2 [21], and FeCl 3 [22], have also been reported to catalyze these reactions by coordination with the hydroxy moiety, thereby increasing its leaving group ability [23–28].…”