and serves as a driving force to promote the cyclizations. Although the cyclization rates can be accelerated when the formyl group carries α-dimethyl substituents, unfortunately β-scission of the alkoxy radicals becomes competitive with the 1,3-stannyl shift. The β-stannyloxy radicals can be employed in further cyclizations to obtain tandem cyclization products.
Chiral amines with a hydrogen bond donor promote the intramolecular conjugate addition of aldehydes to vinyl sulfones. Chiral cyclic sulfone-aldehydes are obtained in good yields with an ee of up to 82%. (C) 2010 Elsevier Ltd. All rights reserved.
Campi, Eva M.; Jackson, W. Roy; Perlmutter, Patrick, Australian Journal of Chemistry, 1993, vol. 46, # 7, p. 995 - 1007
作者:Campi, Eva M.、Jackson, W. Roy、Perlmutter, Patrick、Tasdelen, E. Elizabeth
DOI:——
日期:——
ANDERSEN, N. H.;MCCRAE, D. A.;GROTJAHN, D. B.;GABHE, S. Y.;THEODORE, L. J+, TETRAHEDRON, 1981, 37, N 23, 4069-4079
作者:ANDERSEN, N. H.、MCCRAE, D. A.、GROTJAHN, D. B.、GABHE, S. Y.、THEODORE, L. J+