posted on 2020-03-24, 20:43authored byYao Luo, Hang Zhang, Siyuan Wang, Yuqiao Zhou, Shunxi Dong, Xiaoming Feng
Highly enantioselective
ring-opening/cycloaddition reactions of
cyclobutenones were achieved by employing chiral N,N′-dioxide/metal complexes as the catalysts. The Diels–Alder
type cycloaddition with (E)-alkenyloxindoles yielded
spirocyclohexaneoxindoles with excellent results. Meanwhile, a hetero-Diels–Alder
process occurred with (E)-dioxopyrrolidines to afford
spiropyrrolidinone-dihydropyranone derivatives.