Allyl carbonates, 2- cycloaddition palladium catalysis

Other resnlts obtained by Tsnji s group up to 1987 using allyl carbonates are carbony-lations to afford /3,y-nnsatnrated esters " (Scheme 3) (see Sect. VI.3), cycloadditions of trimethylenemethane palladium complex to afford methylenecyclopentanes (Scheme 3), and cycloadditions of zwitterions to afford substituted vinylcyclopentanes (Scheme 4) (see Sect. V.2.5.2). 2-Butene-1,4-diol dicarbonates afford a variety of cyclic strnctnres by reaction with dinncleophiles nnder Pd(0) catalysis (see Sect. I). The first case reported seems to be the formation of the vinylcyclopropane of Scheme 44" ... 

The [2+2] cycloaddition of a ketene and an imine leading to P-lactams can be accomplished using palladium catalysis. Starting from an allyl phosphate or allyl chloride (see also 1), carbonylation with carbon monoxide lead to an intermediate ketene that cycloadds to imines to form the desired P-lactams (Scheme 5-176). ... 

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