Alkylation and spiroannulation of 3-bromo-2-cycloalken-1-ones via radical intermediates
作者:Eun Lee、Sung Lee Dae
DOI:10.1016/s0040-4039(00)97616-0
日期:——
Reaction of 3-bromo-2-cycloalken-l-ones with various alkenes in the presence of tributylstannane resulted in the formation of 3-alkylated and 3-spiroannulated products.
A variety of substituted 1-oxaspiro[4,5]dec-6-ene and 1-oxaspiro[5,5]undec-7-ene systems have been prepared by utilizing Amberlyst-15-catalyzed S(N)2' oxaspirocyclizations under mild reaction conditions (-20 degrees C) in quantitative yields. In this process, a tertiary allylic alcohol serves as the precursor of pi-allylic carbocation and the primary, secondary or tertiary alcohol within the same molecule serves as the nucleophile, (C) 2000 Elsevier Science Ltd. All rights reserved.
EUN, LEE;DAE, SUNG LEE, TETRAHEDRON LETT, 31,(1990) N0, C. 4311-4312