Intramolecular reaction of β-(alkoxycarbonyl)allylsilane with epoxide into α-methylene-δ-lactones fused to carbocycles
摘要:
Intramolecular cyclization of omega-epoxy-beta-ethoxycarbonylallylsilane (1) was effected with Lewis acids to give a good yield of 5-exo-cyclization products (5 and 6), and a small amounts of d-endo-product (7). The 5-exo-products were converted into alpha-methylene-delta-butyrolactone (6La and b) fused to cyclopentane.
Intramolecular reaction of β-(alkoxycarbonyl)allylsilane with epoxide into α-methylene-δ-lactones fused to carbocycles
摘要:
Intramolecular cyclization of omega-epoxy-beta-ethoxycarbonylallylsilane (1) was effected with Lewis acids to give a good yield of 5-exo-cyclization products (5 and 6), and a small amounts of d-endo-product (7). The 5-exo-products were converted into alpha-methylene-delta-butyrolactone (6La and b) fused to cyclopentane.
Intramolecular cyclization of omega-epoxy-beta-ethoxycarbonylallylsilane (1) was effected with Lewis acids to give a good yield of 5-exo-cyclization products (5 and 6), and a small amounts of d-endo-product (7). The 5-exo-products were converted into alpha-methylene-delta-butyrolactone (6La and b) fused to cyclopentane.