o-Cyanobenzyllithium (3) was efficiently generated by lithium-tellurium exchange of the corresponding benzylic telluride 2 prepared in situ from lithium butanetellurolate and α-bromo-o-tolunitrile (1). Reaction of ketones or aldehydes with 3 afford substituted 2-hydroxyethylbenzonitriles 4 in high yields. The subsequent acid-catalyzed lactonization gave 3-substituted 3,4-dihydroisocoumarins 5 in good yields. All these successive reactions could be performed in the same reaction flask without isolation of intermediates.
Heteroannulation via intramolecular (.pi.-allyl)palladium displacement
作者:R. C. Larock、L. W. Harrison、M. H. Hsu
DOI:10.1021/jo00193a047
日期:1984.9
LAROCK, R. C.;HARRISON, L. W.;HSU, M. H., J. ORG. CHEM., 1984, 49, N 19, 3662-3664
作者:LAROCK, R. C.、HARRISON, L. W.、HSU, M. H.
DOI:——
日期:——
Synthesis of isocoumarins via thallation-olefination of benzoic acids
作者:R. C. Larock、S. Varaprath、H. H. Lau、C. A. Fellows
DOI:10.1021/ja00330a041
日期:1984.9
Par thallation de l'acide benzoique puis alcenylation en presence de PdCl 2 du carboxy-2 phenyl bis-trifluoroacetoxy thallium obtenu, on prepare diverses isocoumarines et dihydro-3,4 isocoumarines
在 PdCl 2 du carboxy-2 苯基双-三氟乙酰氧基铊 obtenu 存在下进行部分 thallation de l'acide benzoique puis alcenylation,制备不同的异香豆素和二氢-3,4 异香豆素