A new procedure for the synthesis of quinone monoketals derived from a variety of diols has been developed involving treatment of the readily available dimethyl ketals with diols and BF3.etherate in DME.
Highly Enantioselective Catalytic Conjugate Additions to Cyclohexadienones
作者:Rosalinde Imbos、Mirjan H. G. Brilman、Mauro Pineschi、Ben L. Feringa
DOI:10.1021/ol990707u
日期:1999.8.1
Enantioselective copper phosphoramidite-catalyzed conjugate addition of dialkylzinc reagents (R2Zn) to several 4,4-disubstituted cyctohexadienones was achieved with dr's up to 99/1 and ee's up to 99%.
Photochemical rearrangements of quinone monoketals
作者:Michael C. Pirrung、David S. Nunn
DOI:10.1016/0040-4020(96)00207-4
日期:1996.4
provides, after hydrolysis, β-carboxy-substituted cyclopentenones. With a substituent at the β-position of the quinone monoketal, rearrangement selectivity is modestly in favor of the more substituted alkene product. With a substituent at the α-position of the quinone monoketal, rearrangement selectivity is strongly in favor of the less substituted alkene product. Possible mechanistic reasoning to explain