作者:Yajun Li、Fraser F. Fleming
DOI:10.1002/anie.201607806
日期:2016.11.14
an efficient, direct synthesis of alkene isocyanides. The one‐pot sequence involves a series of carefully orchestrated steps: addition, formylation, tautomerization, and dehydration, with CuCN catalyzing a key equilibration of a formyl imine to an N‐formyl enamine. The resulting aromatic alkeneisocyanides, that are otherwise challenging to synthesize, engage in an unusual [4+2]‐type cycloaddition/1
将RLi顺序添加到腈中,用异丙基甲酸酯捕集,再用磷酰氯脱水,可以有效,直接地合成烯烃异氰酸酯。单罐序列涉及一系列精心安排的步骤:加成,甲酰化,互变异构化和脱水,CuCN催化甲酰亚胺与N-甲酰烯胺的关键平衡。所得的芳香族烯烃异氰酸酯可能难以合成,它们会以不寻常的[4 + 2]型环加成/ 1,3-H移位/脱氰顺序生成取代的萘。