γ-Alkoxylactones as autounmasking synthons for a one-step construction of 1,3-oxygenated cyclopentanes. Synthesis of fredericamycin A core and spirobenzylisoquinoline alkaloids
作者:S. V. Kessar、Rahul Vohra、Nachhattar Pal Kaur、Kamal Nain Singh、Paramjit Singh
DOI:10.1039/c39940001327
日期:——
3-indenyllithium leads to fredericamycin A core compound 5, whereas condensation of methylenedioxyphthalide 7b or 8 with lithiated N-methyltetrahydroisoquinoline–BF3 complex 9 affords spirobenzylisoquinolinealkaloids raddeanine 12, corydaine 13 and yenhusomidine 13.