Sunlight-Driven Forging of Amide/Ester Bonds from Three Independent Components: An Approach to Carbamates
摘要:
A photoredox catalytic route to carbamates enabled by visible irradiation (or simply sunlight) has been developed. This process leads to a novel approach to the construction of heterocyclic rings wherein the amide or ester motifs of carbamates were assembled from three isolated components. Large-scale experiments were realized by employing continuous flow techniques, and reuse of photocatalyst demonstrated the green and sustainable aspects of this method.
Sunlight-Driven Forging of Amide/Ester Bonds from Three Independent Components: An Approach to Carbamates
摘要:
A photoredox catalytic route to carbamates enabled by visible irradiation (or simply sunlight) has been developed. This process leads to a novel approach to the construction of heterocyclic rings wherein the amide or ester motifs of carbamates were assembled from three isolated components. Large-scale experiments were realized by employing continuous flow techniques, and reuse of photocatalyst demonstrated the green and sustainable aspects of this method.
Carbon dioxide: a reagent for the simultaneous protection of nucleophilic centres and the activation of alternative locations to electrophilic attack.
作者:Alan R. Katritzky、Wei-Qiang Fan、Kunihiko Akutagawa
DOI:10.1016/s0040-4020(01)87558-x
日期:1986.1
N-Methyl- and M-ethyl-aniline are regiospecifically converted into a range of ortho-substituted derivatives, using carbondioxide both for M-protection and as an intermediate carbanion stabilizing group, and -butyllithium to lithiate the ortho-carbon atom. The resulting lithium N-(ortho-substituted-phenyl)-N-methyl- and -N-ethyl-carbamates undergo smooth acid-catalysed decarboxylation under mild conditions
derivatives has been accomplished from aniline-derived 1,3-aminoalcohols and N-sulfonyl-1,2,3-triazole. The developed reaction demonstrates the new reactivity of azavinyl carbenes and allows access to diverse substituted dihydro-3,1-benzoxazines in good yields. Importantly, the reaction was readily extended to diols and could be used for selective protection of amino alcohols with N-sulfonyl-1,2,3-triazole
A photoredox catalytic route to carbamates enabled by visible irradiation (or simply sunlight) has been developed. This process leads to a novel approach to the construction of heterocyclic rings wherein the amide or ester motifs of carbamates were assembled from three isolated components. Large-scale experiments were realized by employing continuous flow techniques, and reuse of photocatalyst demonstrated the green and sustainable aspects of this method.