Enantioselective heterocyclic synthesis of spiro chromanone–thiochroman complexes catalyzed by a bifunctional indane catalyst
作者:Yaojun Gao、Qiao Ren、Hao Wu、Maoguo Li、Jian Wang
DOI:10.1039/c0cc03489d
日期:——
benzylidenechroman-4-ones and 2-mercaptobenzaldehydes for efficient construction of spiro chromanone-thiochroman complexes were accomplished with high yields and excellent selectivities via a novel bifunctional indane catalyst.
An efficient asymmetriccascadereaction catalyzed by a chiral bifunctional indane amine–thiourea catalyst has been developed. From a broad substrate scope, chiral dihydro-2H-pyran complexes that contained two stereogenic centers were obtained in a one-pot manner in good to excellent yields (72–97%) and high to excellent stereoselectivities (92–97% ee).
Asymmetric organocatalytic cascade Michael/hemiketalization/retro-Henry reaction of β,γ-unsaturated ketoesters with α-nitroketones
作者:Yaojun Gao、Qiao Ren、Woon-Yew Siau、Jian Wang
DOI:10.1039/c1cc11124h
日期:——
An unprecedented enantioselective organocatalytic Michael/hemiketalization/retro-Henry cascade sequence is described, which catalyzed by a simple bifunctional indane amine-thiourea catalyst. This process provides a new route to the enantioselective synthesis of 5-nitro-pent-2-enoates, a precursor to α-ketolactam.