Stereoselective synthesis of 2,5-dihydrofurans by sequential SN2' cleavage of alkynyloxiranes and silver(I)-catalyzed cyclization of the allenylcarbinol products
作者:James A. Marshall、Kevin G. Pinney
DOI:10.1021/jo00077a048
日期:1993.12
The alkynyloxiranes 5a,b, 7, and 18 afford mainly the anti S(N)2' products 6a,b, 8, and 19a upon treatment with Me2CuLi. The derived primary alcohol silyl ethers 9a,b, 10, and 19b-d undergo Ag+-catalyzed cyclization to the 2,5-dihydrofurans 11a,b, 12, and 20b-d. Diol 26 affords mainly the fused ring 2,5-dihydrofuran 32 under these conditions. The stereochemistry of dihydrofuran 20a was confirmed by conversion to the known epoxide 21a.