Nickel- and Rhodium-Catalyzed Addition of Terminal Silylacetylenes to Propargyl Amines: Catalyst-Dependent Complementary Regioselectivity
摘要:
The cross-addition of terminal silylacetylenes to gamma-arylated propargyl amines occurs efficiently via C-H cleavage by using either a nickel or rhodium catalyst. Taking advantage of the catalyst-controlled switching of regioselectivity in the reaction, both the 2- and 3-alkynylallylamines are readily accessible from the same starting materials.
A Highly Efficient Gold-Catalyzed Photoredox α-C(sp<sup>3</sup>)H Alkynylation of Tertiary Aliphatic Amines with Sunlight
作者:Jin Xie、Shuai Shi、Tuo Zhang、Nina Mehrkens、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/anie.201412399
日期:2015.5.11
A new α‐C(sp3)H alkynylation of unactivated tertiaryaliphaticamines with 1‐iodoalkynes as radical alkynylating reagents in the presence of [Au2(μ‐dppm)2]2+ in sunlight provides propargylic amines. Based on mechanistic studies, a CC coupling of an α‐aminoalkyl radical and an alkynyl radical is proposed for the C(sp3)C(sp) bond formation. The mild, convenient, efficient, and highly selective C(sp3)H
The cross-addition of terminal silylacetylenes to gamma-arylated propargyl amines occurs efficiently via C-H cleavage by using either a nickel or rhodium catalyst. Taking advantage of the catalyst-controlled switching of regioselectivity in the reaction, both the 2- and 3-alkynylallylamines are readily accessible from the same starting materials.