An efficient asymmetricsynthesis of isochromanone derivatives was realized through Z-selective-1,3-OH insertion/aldol cyclization reaction involving acyclic carboxylic oxonium ylides. The combination of achiral dirhodium salts and chiral N,N′-dioxide–metal complexes, along with the use of α-diazoketones instead of α-diazoesters, enables the cascade reaction efficiently. A variety of benzo-fused δ-lactones
Experiments in the Colchicine Field. V. The Thermal and Photochemical Decomposition of Various 2-(β-Phenylethyl)-phenyldiazomethanes and 2-(γ-Phenylpropyl)-phenyldiazomethanes<sup>1</sup>
作者:C. David Gutsche、Emil F. Jason、Robert S. Coffey、Herbert E. Johnson
DOI:10.1021/ja01554a043
日期:1958.11
Hanson; Tarte, Bulletin des Societes Chimiques Belges, 1957, vol. 66, p. 619,627