Allyl carbonates conjugated diene preparation

Titanium acetylides react with 3-benzyl-tetrahydro-l,3-oxazines and 1,3-oxazolidines to give the corresponding / -aminoacetylenes in modest to good yield.296 Vinyl Ti(iv) species prepared by the alkylation of vinylcarbene complexes with BTCl react with aldehydes to give allylic alcohols. Reaction with terminal alkynes produces conjugated dienes, in which a vinyl group regioselectively bonds to the unsubstituted side of carbon-carbon triple bond.297... [Pg.376]

Hetero- or homoannular conjugated dienes are prepared in hydronaphthalene derivatives by the Pd-catalyzed regioselective elimination of allylic carbonates under mild conditions. The heteroannular conjugated diene 496 was obtained selectively by the Pd-catalyzed regioselective elimination of the -oriented allylic carbonate 494 under mild conditions via the stable intermediate 495. The homoan-... [Pg.495]