(B2(Pin)2) to approach functionalized dibenzo[b,f][1,4]oxazepine derivatives is developed. The chiral products are obtained in up to 81% yield, >20:1 dr, and 98% ee when either a chiral diphosphine ligand or a chiral ferrocenyl‐based P,N‐ligand is used. Furthermore, the reaction exhibits reversed diastereoselectivities when the chiral diphosphine ligand and the chiral P,N‐ligand are used respectively.
Photoredox-Catalyzed α-Aminoalkylcarboxylation of Allenes with CO<sub>2</sub>
作者:Hyungwoo Hahm、Doohyun Baek、Dowon Kim、Seongwook Park、Jeong Yup Ryoo、Sukwon Hong
DOI:10.1021/acs.orglett.1c01011
日期:2021.5.21
The photoredox-catalyzed α-aminoalkylcarboxylation of aryl allenes with CO2 and N,N-dimethylanilines is reported for the first time (26 examples, up to 96% yield). In the case of electron-deficient allenes, good regioselectivity was observed (up to 94:6), exclusively generating kinetic products over thermodynamic products. This protocol is a novel synthetic method for highly functionalized β,γ-unsaturated
Catalytic Hydrophosphination of Allenes Using an Iron(II) β-Diketiminate Complex
作者:Ruth L. Webster、Callum R. Woof、Thomas G. Linford-Wood、Mary F. Mahon
DOI:10.1055/a-1902-5592
日期:2023.3
A rare study into the catalytic hydrophosphination of allenes is reported. Employing an Fe(II) β-diketiminate pre-catalyst, the reaction of HPPh2 proceeds with a range of aryl- and alkylallenes. For arylallenes the E-vinyl product forms as the major species, while the 1,1-disubstituted alkene is formed in a larger ratio than the Z-vinyl product (e.g., 6:3:1 as E/1,1/Z). The use of H2PPh results in