ndole derivatives is realized through the rhodium(II)-catalyzed three-componentreaction of diazoamides, aldehydes and β-nitrostyrenes. The reactions are conducted under mild conditions and the products are obtained in moderate to good yields with excellent regio- and diastereoselectivity. A biology-oriented synthesis of 3,3-spiro(2-tetrahydrofuranyl)oxindole derivatives is realized through the rhodium(II)-catalyzed
Privilege-Structure-Oriented Three-Component Asymmetric Aminomethylation: Assembly of Chiral 3-Aminomethyl Indolones
作者:Zhenghui Kang、Dan Zhang、Xinfang Xu、Wenhao Hu
DOI:10.1021/acs.orglett.9b03787
日期:2019.12.20
The asymmetric aminomethylation reaction of 3-diazooxindoles with electronic-rich arenes and N,O-acetals cooperatively catalyzed by achiral dirhodium complex and chiral phosphoric acid is reported. The reaction provides a novel method for the facilesynthesis of chiral 3-aminomethyl oxindoles with an all-carbon quaternary center in good yields (82-98%) with high to excellent enantioselectivities (up
The cyclopropanation reaction of 3-diazooxindoles with arenes was first accomplished using visible-light irradiation. A series of spiro[norcaradiene-7,3′-indolin]-2′-ones were synthesized for the first time in high yields and with excellent diastereoselectivities. The synthetic usefulness of this catalyst-free photochemical methodology is illustrated by the further controllable rearrangement and epoxidation
Rh(II)/Ag(I)-Cocatalyzed Three-Component Reaction <i>via</i> S<sub>N</sub>1/S<sub>N</sub>1′-Type Trapping of Oxonium Ylide with the Nicholas Intermediate
作者:Zhenghui Kang、Jiayi Shou、Dong Xing、Wenhao Hu
DOI:10.1021/acs.joc.0c01162
日期:2020.8.7
Rh(II)/Ag(I)-cocatalyzed three-component reaction of propargylic alcohol–Co2(CO)6 complexes with diazo compounds and benzyl alcohols is described, which represents the first trapping process of oxoniumylides with carbocations via the SN1/SN1′-type pathway. This transformation provides an efficient approach for construction of dicobalt hexacarbonyl-complexed 3,3-disubstituted oxindoles. Further derivatization of
描述了Rh(II)/ Ag(I)催化的炔丙醇-Co 2(CO)6配合物与重氮化合物和苄醇的三组分反应,这是通过S捕获氧鎓叶立德与碳正离子的第一个过程。ñ 1 / S ñ 1'-型通路。该转变为构建双钴二羰基六羰基配合物的3,3-二取代的羟吲哚提供了有效的方法。产物的进一步衍生化,是通过二甲杂萘酚物种的剥夺而引发的,得到具有烯炔基和特权的螺氧杂吲哚-乙烯基二氢吡喃结构的3,3-二取代的羟吲哚。