Gold(III) porphyrin-catalyzed cycloisomerization of allenones.
[reaction: see text] Gold(III) porphyrin-catalyzed cycloisomerization of allenones gave the corresponding furans in good to excellent yields (up to 98%) and with quantitative substrate conversions. By recovering the Au(III) catalyst, a recyclable catalytic system is developed with over 8300 product turnovers attained for the cycloisomerization of 1-phenyl-buta-2,3-dien-1-one. The versatility of the gold(III) porphyrin catalyst was exemplified by its application to the hydroamination and hydration of phenylacetylene in 73% and 87% yield, respectively.
Zhou
Cong-Ying
CY
Department of Chemistry, The University of Hong Kong, Hong Kong.
Chan
Philip Wai Hong
PW
Che
Chi-Ming
CM