作者:Martta Asikainen、William Lewis、Alexander J. Blake、Simon Woodward
DOI:10.1016/j.tetlet.2010.10.013
日期:2010.12
Reaction of cuprates derived from R3MgBr/CuI/LiBr (R3 = n-alkyl) with R1CCCH(O2CR2)2 (R1 = sp2 hybridised substituent, R2 = mainly Me, alkyl, Ph) provides access to allenyl esters R1R3CCCH(O2CR2) (51–88%). Such species are not accessible via rearrangement of precursor propargylic R1R3C(O2CR2)CCH.
Allenyl ester precursors for 1H-inden-1-ol carboxylates: comparisons with their propargylic equivalents having terminal alkyne functions
作者:Martta Asikainen、Simon Woodward
DOI:10.1016/j.tet.2012.04.086
日期:2012.7
and their isomeric equivalents the terminal propargylic carboxylates, ArC(R1)(O2CR2)CCH, in gold-catalyzed carbocyclization to indenes provides information on 1,3 and 1,2-carboxylate shifts associated with their interconversion. Allenyl carboxylates transform specifically to 1H-inden-1-yl carboxylates in high yields, under AuI-catalysis. Their equivalent propargylic carboxylates give complex mixtures