Tin-promoted stereocontrolled intramolecular allylation of carbonyl compounds: a facile and stereoselective method for ring construction
作者:Jing-Yao Zhou、Zhao-Gen Chen、Shi-Hui Wu
DOI:10.1039/c39940002783
日期:——
The intramolecular allylation of carbonyl compounds 1 promoted by metallic tin proceeds in a stereocontrolled manner to give cyclic products 2 with high diastereoselectivity.
The N-heterocyclic carbene (NHC) catalyzed addition reaction has been well documented recently; however, the NHC-catalyzed substitution reaction especially the S(N)2' type reaction remains a challenge. As one of the most fundamental reaction types in organic chemistry, the S(N)2' reaction catalyzed by NHC would be a powerful tool in organic synthesis. Therefore, the first NHC-catalyzed intramolecular S(N)2' substitution reaction of aldehyde with allylic electrophiles has been developed. A variety of alpha,beta-unsaturated chromanones were obtained under a domino S(N)2' reaction and isomerization. Mechanistic experiments were conducted to confirm the nature of this S(N)2' reaction.
WENDER, PAUL A.;CRISSOM, JANET WISNIEWSKI;HOFFMANN, URSULA;MAH, ROBERT, TETRAHEDRON LETT., 31,(1990) N6, C. 6605-6608
作者:WENDER, PAUL A.、CRISSOM, JANET WISNIEWSKI、HOFFMANN, URSULA、MAH, ROBERT