Development of a New Spiro-BOX Ligand and Its Application in Highly Enantioselective Palladium-Catalyzed Cyclization of 2-Iodoanilines with Allenes
作者:Wei Shu、Qiong Yu、Shengming Ma
DOI:10.1002/adsc.200900607
日期:2009.11
In this communication, we report the synthesis of a new chiral spiro-bisoxazoline ligand, i.e., β-naphthylmethyl-substituted spiro-BOX [(Ra,S,S)-L7] and have successfully applied it to the palladium-catalyzedenantioselectivecyclization reaction of simple allenes with o-aminoiodobenzenes, affording highly optically active 3-alkylideneindolines in good yields with excellent enantiomeric excesses.
Cobalt‐Catalyzed Intermolecular [2+2] Cycloaddition between Alkynes and Allenes
作者:Wei Ding、Naohiko Yoshikai
DOI:10.1002/anie.201813283
日期:2019.2.18
An intermolecular [2+2] cycloaddition reaction between an alkyne and an allene is reported. In the presence of a cobalt(I)/diphosphine catalyst, a near equimolar mixture of the alkyne and allene is converted into a 3‐alkylidenecyclobutene derivative in good yield with high regioselectivity. The reaction tolerates a variety of internal alkynes and mono‐ or disubstituted allenes bearing various functional
Cobalt-Catalyzed Hydroacylative Dimerization of Allenes Leading to Skipped Dienes
作者:Wei Ding、Yan King Terence Ho、Yasuhiro Okuda、Christopher Kevin Wijaya、Zheng Hao Tan、Naohiko Yoshikai
DOI:10.1021/acs.orglett.9b02465
日期:2019.8.2
A cobalt–diphosphine catalyst has been found to promote a selective 1:2 coupling reaction between aldehydes and allenes to form β,δ-dialkylidene ketones, featuring skipped diene moieties, with high regioselectivities and stereoselectivities. The reaction is distinct from previously reported, rhodium-catalyzed aldehyde–allene 1:2 coupling to afford β,γ-dialkylidene ketones bearing 1,3-diene moieties