Catalytic Allylation of Aldehydes Using Unactivated Alkenes
作者:Shun Tanabe、Harunobu Mitsunuma、Motomu Kanai
DOI:10.1021/jacs.0c04735
日期:2020.7.15
and a chromium complex catalyst, enabling catalytic allylation of aldehydes with simplealkenes, including feedstock lower alkenes. The reaction proceeded under visible-light irradiation at room temperature and with high functional group tolerance. The reaction was extended to an asymmetric variant by employing a chiral chromium complex catalyst.
Highly Functionalized <i>tertiary-</i>Carbinols and Carbinamines from the Asymmetric γ-Alkoxyallylboration of Ketones and Ketimines with the Borabicyclodecanes
作者:Lorell Muñoz-Hernández、Luis A. Seda、Bo Wang、John A. Soderquist
DOI:10.1021/ol5019486
日期:2014.8.1
asymmetric γ-alkoxyallylboration of representative ketones provides β-alkoxy tert-homoallylic alcohols 10 whose diastereoselectivities range from 99% syn (acetophenone) to 99% anti (pinacolone) both with high ee (>95%). This distribution is attributable to the c/t isomerization of the BBD reagents and the greater reactivity of 7 vs 1 and of aromatic vs alkyl ketones. A ketone-based direct synthesis of a fostriecin
Stereoselective acyclic synthesis via allylmetals: vicinal diols from γ-alkoxyallylaluminium compounds and aldehydes or ketones
作者:Masato Koreeda、Yoshio Tanaka
DOI:10.1039/c39820000845
日期:——
The reaction of in situ generated γ-alkoxyallylaluminiumcompounds with aldehydes or ketones at –78 °C leads to the highly diastereoselective formation of mono-protected vicinaldiols; the precursor to exo-brevicomin was efficiently synthesised using this method.
Bu<sub>4</sub>NF–BF<sub>3</sub>·Et<sub>2</sub>O as a new reagent for the selective deprotection of the enol ethers of γ-alkoxyallylstananes
作者:Vladimir Gevorgyan、Yoshinori Yamamoto
DOI:10.1039/c39940000059
日期:——
The combination of Bu4NFâBF3·OEt2 deprotects selectively the enol ether protecting group of γ-alkoxy- and benzyloxy-allytributylstannanes, without destannylating the tributylstannyl group, affording the corresponding γ-tributylstannyl aldehyde in high yield.