Highly Stereoselective Olefin Cyclopropanation of Diazooxindoles Catalyzed by a C2-Symmetric Spiroketal Bisphosphine/Au(I) Complex
摘要:
A spiroketal bisphosphine (SKP) derived chiral digold complex is identified as a powerful catalyst for the highly diastereo- and enantioselective synthesis of spirocyclopropyloxindoles from diazooxindoles and a broad range of alkenes, including both cis and trans 1,2-disubstituted alkenes.
A Highly Diastereo- and Enantioselective Hg(II)-Catalyzed Cyclopropanation of Diazooxindoles and Alkenes
作者:Zhong-Yan Cao、Feng Zhou、Yi-Hua Yu、Jian Zhou
DOI:10.1021/ol302998m
日期:2013.1.4
It is reported for the first time that Hg(II) can catalyze the cyclopropanation of diazo reagents and alkenes, which contributes to the unprecedented highlydiastereo- and enantioselective synthesis of spirocyclopropyloxindoles.
Catalytic Asymmetric Cyclopropanation with Diazooxindole
作者:Takayoshi Arai、Atsuko Awata
DOI:10.1055/s-0032-1317746
日期:——
The first catalyticasymmetriccyclopropanation using styrene and diazooxindole was achieved with Rh2(S-PTTL)4. The reaction proceeded smoothly with 1 mol% catalyst loading to provide a good yield of the biologically important spiro-cyclopropyloxindole product with moderate to good enantioselectivity and excellent diastereoselectivity.